One Iron Golf Pro-Line Single Length Clubs Collection 8 Iron Set
1 Iron Golf Pro-Line Wedges Collection GW, SW, LW
1 Iron Golf Pro-Line Irons on White background
One Iron Golf Pro-Line Full 11 iron set
Pro-Line Specifications Chart for One Iron Golf
Closeup of Grip used on One Iron Golf clubs
One Iron Golf Pro-Line Single Length Clubs Collection 8 Iron Set
1 Iron Golf Pro-Line Wedges Collection GW, SW, LW
1 Iron Golf Pro-Line Irons on White background
One Iron Golf Pro-Line Full 11 iron set
Pro-Line Specifications Chart for One Iron Golf
Closeup of Grip used on One Iron Golf clubs

Pro-Line Irons

Regular price $699.00

Shipping calculated at checkout.

Since we custom build all orders, please allow 7-10 business days for your order to ship. For questions, please contact us. Thank you!

Precision Tooling, Shaft Balancing, and Club Stability for the ultimate in Precise Shot Making. Modeled after touring irons, maximize your distance without compromising accuracy.

  • Available in Right and Left Hand.
  • Custom fitted based upon your wrist-to-floor measurement (see below for measurement instructions).  
  • Tour proven clubhead design.
  • 2º stronger loft angles throughout the set for increased distance.
  • Lighter clubhead weight for increased swing speed and distance.
  • Deep undercut rear cavity produces and extremely low COG for maximum trajectory and distance.
  • Identical club length, clubhead lie angle, swing-weight and (MOI), and shaft flex throughout the set.
  • Steel shafted for the highest level of consistency/accuracy.
  • Shaft flex plane orientation (Spine Align/Puring).
  • State of the art precision casting, grinding, and polishing.
  • Optimized shaft tip section for extreme stability through impact and tighter shot dispersion.
  • Latest groove technology for maximum back-spin.
  • Installed with 1/16” oversized textured grips.
  • Conforms with the Rules of Golf.
  • Built in the USA.

Shop the Pro-Line Combo Sets and Used/Demo Pro-Line Iron Sets.

Custom Fitting Single Length Irons

All human beings share the same skeletal, muscle, tendon, and joint functions and from a mechanical standpoint are the same regardless of height or sex. Non-mechanical differences arise in custom fitting however, for instance: the height of a bicycle seat needs to be greater for a taller person than a shorter person even though the mechanical design of the bicycle remains the same. By the same token there is only one true fitting variable in the building of golf clubs and that is club length. Based upon your wrist-to-floor measurement we adjust your club length to correspond to the lie angle of our club-heads in order to ensure a proper fitting.

Wrist-to-Floor Measurement
Taking your Wrist-to-Floor Measurement:
  • The wrist-to-floor measurement should be taken while standing on a hard surface.
  • Wear jogging/gym shoes (not golf shoes).
  • Stand with your back against the wall at strict military attention. Place your shoulders and head against the wall, your feet together, and your arms rigid and straight down at your sides.
  • Hold a pencil in your right hand (right handed golfer). Back your arms against the wall and then take the pencil and make a mark where your left wrist joint hits the wall. Just the opposite for a left-handed golfer.
  • Measure from this mark to the floor.
  • Important: Do not round-up the measurement to the next higher inch increment. For instance, if your measurement is 34 and 7/8″, do not round up to 35″.

One Iron Golf Club Lengths

One Iron Golf Club Lengths - Wrist to Floor Measurements

Very Important:

Do not order based upon what you consider to be your favorite iron (ie: #7 iron), and do not use that corresponding wrist-to-floor measurement when placing your order. When ordering you need to specify your actual wrist-to-floor measurement to ensure a proper fitting. This chart reflects club length based upon our club-head lie angles. Consequently, our fitting process does not apply to any other brand.

For the taller golfer:  based upon your wrist-to-floor measurement you may be concerned that your irons would be a typical #3 or #4 iron club length; however, do not compare your measurement to your current #3 or #4 iron. The lie angles of your “long” irons are much flatter than ours which, at your size, requires you to bend over excessively and reach out for the ball at address. The club head lie angle of our irons is 63.5º which is far more upright and allows you, for the first time, to stand upright and much closer to the ball at address resulting in the ideal upright swing posture and swing plane. The taller golfer benefits the most from our fitting formula since they have never played golf clubs that have even come close to fitting them properly. The result being that they have had to develop a very inefficient posture and swing where they are bent over excessively and reaching way out for the ball with every iron in the bag.

How Does the Wrist-to-Floor Measurement Work?

It is based upon trigonometry. At the point of ball impact in the downswing, your wrist, the ground, and the club-head, form a right triangle. Assuming an ideal swing posture, there is a non-linear mathematical relationship between your wrist-to-floor measurement while standing at attention and your wrist-to-ground distance at ball impact.

The club-head lie angles are known for the irons and fairway woods as well as the length of one side of the right triangle based upon your mathematically factored wrist-to-ground distance at impact. This gives us the measurement of two angles and the length of one side. We then use trigonometry to solve for the hypotenuse or club length. This is somewhat oversimplified as we factor in shaft deflection and numerous other factors. The fitting formula that we developed produces the ideal golf club length for anyone regardless of height or arm length.

Why Conventional Custom Fitting Does Not Work


  • Free Shipping on all purchases within the Continental USA.
  • You can purchase your items using any of the options listed during checkout.
  • Big purchase? Choose Shop Pay at checkout to pay in full or split your purchase into 4 equal installments. Learn more and prequalify during checkout!
  • You will receive an email from us with your tracking number.
  • Ohio residents will be charged 7.25% sales tax.

International Ordering

  • *Free International Shipping on all purchases over $600 USD *(exceptions are South Africa and Ghana where we provide free international shipping on purchases over $1,000 USD)
  • We ship worldwide and we cover the brokerage/clearance fees.
  • Import duties and taxes are the responsibility of the customer and will be collected by the carrier at time of delivery.
    • If these taxes are not paid your order will be shipped back to us and we will deduct from your refund the cost of shipping both ways and the import duties/taxes charged to us.
    • Not sure if you will need to pay import duties and taxes? Check with your local customs office for estimated duties/taxes, or use this link for an estimate in your currency.

Return Policy

Fully try-out our golf clubs at your home course and at your convenience for a full month. We feel that to truly evaluate a set of golf clubs to determine if they are right for you takes time; and hence, our 30-day return policy (does not include Used/Demo golf clubs, Accessories, or Special Orders). To our knowledge we are the only golf club manufacturer in the entire industry who offers a full money-back return policy on golf clubs after they have been played which should tell you volumes about our commitment to our customers.

If you are not completely satisfied you may return your golf clubs within 30-days of receipt for a full refund of your original purchase price (no hidden fees or re-stocking charges). A return authorization must be obtained before we can accept a return of merchandise. Contact us for this authorization on-line through the Contact page of this website. Shipping/handling charges are not refundable. All contents listed on the original Packing Slip must be included for a full refund. Return shipping charges are the responsibility of the customer. Our return policy is only valid once per customer. Any alterations to the original golf club voids this policy.

If shipping from outside the USA make sure to show that the country of origin is the USA and is a return of USA manufactured goods on the customs form. Also, be sure to make clear that you (the shipper) are responsible for all shipping charges and any brokerage/storage/handling/duties and taxes incurred. We will not accept any return package where a payment is due - the shipment will be returned to you at your cost. Any charges incurred by us will be deducted from your refund.

Order Cancellations

You may cancel your order if it has not already shipped, after it leaves our facility it is subject to the Refund Policy (see above). All cancelled orders will be subject to all credit card processing fees assessed which will be deducted from your refund.

Limited Warranty

We warrant our golf clubs to be free of defects in material and workmanship for a period of one year following the original ship date. We will, without charge to the original purchaser, repair or replace the club if it proves to be defective during normal use within this period (normal use does not include misuse or abuse and the associated damages ie: dents on the top, side, rear, or sole of a wood club-head). This does not cover grip or cosmetic wear and tear due to normal usage. Any alterations to the original golf club voids this warranty.

Customer Reviews

Based on 9 reviews
Pedro (Garland, US)
Pro-line 1Irons Consistent and accurate

Very accurate and consistent. About a club longer than the standard 1 iron set. For newer single length players, take the time to adjust and get used to them.

By the second or third week you will see distance and trajectory improvement.

One big key is trying to not over swing. Once you find that rhythm and tempo the Pro-line irons do all the work. You have to put the time in. Don’t make the mistake of going right to the course the first time you get them.

The 1Iron Golf Compony has great support , There web site is a great resource for tips , advice and and specifications of there full club line.

Glenn B. (Saint Paul, US)
Works for me

I’m a fan of the single length irons. Distance wise about the same as “standard” irons, just more consistent in good ball contact.The quality and service from One Iron is exceptional

Customer (Buffalo, US)
My Single-Length irons journey

I gained interest in single length irons when I purchased a set of Cleveland Niblicks in 2018.
Lofts 37, 42, 49 and 56 which are all 35 inches long and 66 degrees lie. I enjoyed the success and consistency and decided to cut my Titleist 695mb's 3-pw to match the Niblicks.
I immediately improved iron play with my entire set modified to 35 inches and adjusted to 66 degrees lie with the help of the local fitter.
I used the modified Titleist set most of 2020 and the 56-degree Cleveland.
My iron play became much improved with the modified Single length Titleist vs the standard-length irons I have used for many years.
The main challenges I had with the Titleist modified set was ball flight and club head weight mainly with 3-7 irons.
Low ball flight made it challenging to stay on the greens as my ball often rolled off the back although I appreciated the low-ball flight on the windy days.
Varying club head weight made my swing feel different between clubs especially with 3-7 irons.
I added (quite a bit) of lead tape to try to resolve this and the guys had fun chuckling at the wad of tape on most of my iron heads and hosels...all in good fun lol...

I started shopping for single length irons and located a set of OneIron Pro-Line 3-Lw.
After reviewing the OneIron website, I made the purchase in Spring of 2021. I had instant success with 4-Pw irons at the range and loved the sweet feeling when connecting a clean shot.
I struggled adjusting to the Gw, Sw, and Lw so I often used a mixed set of my modified Titleist and OneIrons.
This became challenging with consistent ball striking when adjusting from the 35-inch Titleist and 37-inch OneIron clubs during my rounds.
I often would revert to all Titleist to improve consistency. After much practice the Gw, Sw, Lw OneIrons, I now have only the 37” OneIrons 4-Lw in the bag since September and I have thoroughly enjoyed the consistency throughout the set. I have fell in love the longer wedges.
My bag consists of Driver (43"), 3w (43"), 5w (43"), 4-Lw (37"), Pu (35").
I love golf!

Tod M. (Midlothian, US)
Had doubts about single-length wedges

I had gotten so comfortable with my traditional wedges and having a better short game than the folks I play with that moving to single-length wedges seemed a bad idea. However, after really liking the initial results with my Pro-Line irons I bit the bullet and added the wedges. They take some getting used to, but they are working well for me. Another few weeks and I will probably forget I ever used anything else.

Dustin B. (Tampa, US)
These irons Made Golf Fun Again!

I’m a believer... These irons immediately improved my game. I constantly ride the line of wanting to tell everyone I play with and not telling anyone to maintain a competitive advantage. Since implementation of these irons I no longer have the complete meltdown holes of duffing long iron shots or missing greens inside 100 yards. I still have the shot here and there that’s super fat, but I’ll
Tell you what... it still goes straight, every time. I’m now consistently placing 200 yard fairway wood shots onto the green for birdie puts and regularly paring consecutive holes, and If you knew my previous game... you’d be shocked. The consistency and accuracy is remarkable. Since starting these irons ive noticed after each round i feel more and more vindicated with my purchase. I no longer leave feeling like a botched another round of golf. I kick myself every time i pull out my brand new overpriced popular driver and not having spent that money on the dark horse wondering how much better my drive could’ve been... if you’re a guy like me who loves hitting the course with Your buddies and business associates but hates sucking... but these irons.