PTG Removable Pilot Chamber Finish Reamers are machined from premium M-42 Tool Steel. They are individually hand-stoned to cut smooth and chatter free. Made to SAAMI specifications for standardized cartridges and to the current industry standard for popular wildcat cartridges. They feature removable pilots that are held in place with a screw and a 3/8" square drive shank for use with a tap wrench. Reamers include one bushing of nominal bore diameter (additional bushings sold separately). Right hand cut.