These difficult to find screws are favored for their non-slip design. 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. The Master Gunsmith Torx-Style 6-Lobe Ring & Base Screw Kit by Pachmayr saves you time and money on damaged or lost screws.