A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-821-6257
NSN 6240-01-232-9496
NSN 6135-01-408-9244
NSN 5945-01-428-7099
NSN 5950-00-956-3035
NSN 6105-01-418-3070
NSN 5905-00-549-8172
NSN 5950-00-204-1167
NSN 5935-01-153-2662
NSN 6135-01-068-0119
NSN 6650-01-514-0240
NSN 2925-00-005-1618