This nice quality No. 10-32 slotted headless screw is made to REPAIR Thompson Center rifles where the exposed 8-32 threaded screw and threaded seat has been badly damage from attempting to remove it. The original thread was 8-32, it must be drilled and tapped 10-32 to accept this screw. . Not all production T/C guns have this style exposed screw, as T/C moved it to the back side on later guns. Overall length is 0.22".