Clymer's 284 Winchester Finishing Reamer is made from high-quality M-7 High-Speed Steel for professional gunsmithing and is guaranteed to last a lifetime when cared for properly.
The reamer is precision-made to SAAMI specifications and is available in both Rougher and Finisher types, with the Rougher being .010" smaller to reduce wear on the Finisher.
It features 6 right-hand cutting, straight flutes with a solid pilot and integral throat, and comes with a 7/16" round shank with 3/8" square drive, except for the .22 RF which has a ΒΌ" round shank.