1/4"-20 TPI, 0.31 to 0.33" OD, 0.25" L, 304 Stainless Steel, 3-3/8-Coils, Diamond Knurled, Free Running, Screw Threaded Insert T1185-4C250 Screw Threaded Insert Type Diamond Knurled, Free Running Nominal Diameter 1/4 Inch TPI 20 Thread Series UNC-2A...