Pachmayr Master Gunsmith, Hex Head, Screw Kit 3058 These difficult to find screws are favored" non-slip replacements for slotted screws. Packaged in a handy storage box with individual compartments for each size screw. Includes tweezers and a thread size gauge" which also doubles as a shortening jig used to grind a screw to a shorter length. Save time and money with the Master Gunsmith Hex Head Ring & Base Screw Kit" as it comes stocked with everything a gunsmith would need to replace slotted screws. Individual screws not available separately.