A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-00-826-4798
NSN 5920-01-290-7667
NSN 5935-00-222-7028
NSN 5950-01-287-5647
NSN 5915-00-383-1471
NSN 6240-00-333-5627
NSN 2925-00-574-8796
NSN 6130-01-400-6123
NSN 5985-01-196-1191
NSN 5965-01-157-7732
NSN 5895-01-580-1050
NSN 5895-01-244-1541