1/4"-28 TPI, 0.306 to 0.326" OD, 0.625" L, Gray, Dry Film Lubricant, 304 Stainless Steel, 14-1/2-Coils, Diamond Knurled, Screw-Locking, Tanged, Screw Threaded Insert 3591-4CNW0625 Screw Threaded Insert Type Diamond Knurled, Screw-Locking, Tanged Nominal...