A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-00-851-7416
NSN 6645-00-767-6307
NSN 6135-01-136-1059
NSN 6135-00-938-1351
NSN 4140-00-844-3788
NSN 6645-01-163-9930
NSN 5950-01-029-8345
NSN 5975-01-098-5238
NSN 7035-01-123-8723
NSN 6145-00-982-5923
NSN 6645-00-171-9639
NSN 5895-01-193-1070