Strike Industries 1911 Grip Slimline Screw Bushings x 4 Stainless Steel (Screws Sold Separately) 1911 Grip Slimline Screw Bushing - Made of AISI 12L14 Steel, Heat Treated - H: 0.154" x W: 0.267", 0.236-60 tpi exterior threads, 0.150-50 tpi interior threads