5/16"-18 TPI, 0.38 to 0.4" OD, 0.625" L, Gray, Dry Film Lubricant, 304 Stainless Steel, 9-1/4-Coils, Diamond Knurled, Free Running, Tanged, Screw Threaded Insert Screw Threaded Insert Type Diamond Knurled, Free Running, Tanged Nominal Diameter 5/16 Inch...