1/4"-28 TPI, 0.306 to 0.326" OD, 0.25" L, Matte Black, Primer Free II Coated, 304 Stainless Steel, 5-Coils, Diamond Knurled, Screw-Locking, Screw Threaded Insert Screw Threaded Insert Type Diamond Knurled, Screw-Locking Nominal Diameter 1/4 Inch TPI 28...