Are you looking to build a set of Single Length Golf Irons?
You must use component heads that have been designed specifically for that purpose. Each head is designed with the same weight, and same lie angle only the loft changes on each head to control distance.
The Pinhawk SL single length irons are the same length through the 4-Lob wedge set. This allows the golfer to learn one setup for your irons, develop the same swing, on the same plane, same ball position for each iron. This helps to quickly develop consistency throughout the set.
(weight 272 +/- 2 grams)