1/4"-20 TPI, 0.31 to 0.33" OD, 0.375" L, Matte Black, Primer Free II Coated, 304 Stainless Steel, 5-3/4-Coils, Diamond Knurled, Free Running, Screw Threaded Insert Screw Threaded Insert Type Diamond Knurled, Free Running Nominal Diameter 1/4 Inch TPI 20...