A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-445-6970
NSN 5910-00-803-4735
NSN 5960-01-491-9916
NSN 5960-01-453-0999
NSN 6650-00-614-1711
NSN 5998-00-187-0515
NSN 6135-01-549-3744
NSN 6645-01-162-4509
NSN 5920-01-634-0250
NSN 6135-01-122-2656
NSN 7035-00-476-7178
NSN 5945-01-445-5050