A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-415-1028
NSN 5930-01-528-7509
NSN 5950-01-561-8557
NSN 6620-01-622-3035
NSN 4140-01-138-6950
NSN 5990-00-824-0236
NSN 4140-00-167-1705
NSN 6130-01-308-6190
NSN 5920-01-231-3615
NSN 6220-01-618-2491
NSN 5996-01-199-0677
NSN 5985-01-623-5361