Clymer's Rimless Rifle Chambering Reamers are made from high-quality M-7 High-Speed Steel for professional gunsmithing and offer a lifetime of service with proper care.
The reamers are available in Rougher and Finisher types, with Roughers being .010" smaller to save wear on the Finish Reamer when cutting multiple chambers.
These precision tools are made to SAAMI specifications, specifically for the 22-250 Remington cartridge, and feature a 7/16" round shank with 3/8" square drive.