A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-006-5787
NSN 5915-00-934-3446
NSN 5945-01-283-2938
NSN 5996-01-499-1244
NSN 5990-01-024-9659
NSN 6145-01-071-7317
NSN 5855-00-400-2622
NSN 5930-01-417-9796
NSN 6610-01-479-0466
NSN 5930-01-256-1855
NSN 6320-01-198-4024
NSN 5925-01-614-5711