TJ's 1911 Series '80 to Series '70 Conversion Shims (Frame Slot Filler) replace the gap used by the ""Colt Series '80 Firing Pin Block Actuating Levers"" when removed by gunsmiths for crisper trigger pulls. It is nessessary to fill this frame gap so the sear will not wander over and lock up the sear / trigger mechanism. Shim/slot filler fits in the frame cutout, permitting Series 70 slides and components to be fitted to Series 80 frames. No alteration, drop-in fit. Available in the standard .057"" width, as well as .030"", .060"" and .065"". Mfg: Tjs Custom SPECS: Steel, in the-white.