A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-00-006-6064
NSN 6135-01-655-1759
NSN 7035-01-568-0144
NSN 6145-01-359-2378
NSN 5895-01-630-4460
NSN 5998-01-131-9453
NSN 6620-00-124-9515
NSN 5920-00-017-2851
NSN 6240-01-514-7114
NSN 5855-01-332-7594
NSN 5960-01-495-0859
NSN 5915-01-054-3788