A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-435-1387
NSN 6150-01-426-2197
NSN 5895-00-702-6827
NSN 6610-00-773-3004
NSN 5999-01-309-3952
NSN 6240-01-633-9357
NSN 6645-00-192-1152
NSN 5985-01-335-6963
NSN 5895-01-327-2104
NSN 5996-00-187-6266
NSN 5920-01-518-9983
NSN 5975-00-949-1729