The 1 Iron Big-O Putter sole plate
1 Iron Big-O Putter top
Graphic showing how to Measure your current putter length
Graphic showing the putting stroke with counterbalancing and without counterbalancing
1 Iron Big-O Putter Face
1 Iron Big-O Putter grip
The 1 Iron Big-O Putter sole plate
1 Iron Big-O Putter top
Graphic showing how to Measure your current putter length
Graphic showing the putting stroke with counterbalancing and without counterbalancing
1 Iron Big-O Putter Face
1 Iron Big-O Putter grip

1 Iron Big-O Putter

Regular price $249.00

Shipping calculated at checkout.

Meet your new favorite putter - the 1 Iron Big-O Putter! After years of research and testing we are proud to offer the ultimate putter in the golf industry. Designed with extreme counterbalancing, our face balanced putter head is heavier than standard for the highest level of clubhead stability and consistency throughout the stroke. The clubhead is then counterbalanced with a heavier grip than a standard putter so that the center of gravity is moved closer to the player’s hands which promotes the larger muscles of the shoulders in making a pure and smooth pendulum putting stroke for pro-level putting. Our Big-O Putter is not method specific and will drastically improve your putting regardless of your preferred putting method.

To optimize your stroke stability through proper counterbalancing you will want to measure your current putter and then order the next size up Big-O Putter. The extra club length should extend beyond your wrists when you grip the club to ensure optimum counterbalancing. Read more about the 1 Iron Big-O Putter!

Sizes: 35”, 36”, 37”
  • Effective lie angle: 72º
  • Loft Angle: 3º
  • Clubhead weight: 385 grams
  • Grip weight: 155 grams
  • Face balanced
  • Includes Embroidered Black Head Cover
  • Currently available in Right Hand only.
Start sinking putts from all over the green and watch your friends' jaws drop! 

Complement your 1 Iron Big-O Putter with the 1 Iron Dark Horse Driver - Improve your game from beginning to end: 1 Iron Dark Horse Driver

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) not in excess of 1.5" sole.
  • 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 over $100 USD within the Continental USA.
  • You can purchase your items using any of the options listed during checkout.
  • Big purchase? If you live in the USA 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 $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

If you cancel your order prior to it being shipped your refund will be subject to all credit card processing fees assessed which will be deducted from your refund. If you cancel your order after it has shipped you will have to return it to us at your cost. Once we receive the returned order your refund will be subject to all credit card processing fees assessed plus our shipping cost to you 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 11 reviews
Jerry P. (South Jordan, US)
Love this putter!

It is so well-balanced and smooth as I putt. My only regret is buying in late fall rather than the start of the season in early spring! Well made putter!!! Takes the yip and any sway out of my stroke. Had a Heavy Putter but this one is so much better!!!

Bobby D. (Saint Charles, US)
Great putter

Love the putter. Great weight and balance

Randy M. (Denver, US)
Big-Ole` putter that could

“I can’t really put my finger on it. My old putter felt pretty good, but this Big Ole` putter just feels better. And on top of that it sure seems like my puts are rolling truer.

Tim E. (Sheboygan, US)
New Putter

Love it!

Brigham L. (Vancouver, US)
Excellent putter

I’m am putter snub and constantly looking for the next best thing. I have made more long putts than ever before. I’m a work in process but really enjoying this putter. I own all the fairway woods and black stone irons. Playing my best golf and enjoying the game more


13 handicap

Vern M. (Ft. Pierce, US)
it is all good

i am amazed how well i am hitting he ball with my fairway woods

Michael S. (Suwanee, US)
Excellent Customer Service!

David's team provides first class customer service.

Stephen L. (Sydney, AU)
Big O putter

Used demo item like new fast postage

Frank T. (Wichita, US)
Big O

So far so good, not able to play enough rounds to get the good feel, damn winter.

Kevin H. (Lawrenceburg, US)
Big ole putter

Well I tried out the putter today and all I can say is wow,everything felt weighted right and I sunk a lot of putts especially my short putts I was having problems with,whoever uses this putter will cut 6 or more strokes off of there game I’m just mad I didn’t do it sooner smh best putter I’ve ever used…