A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-030-7634
NSN 5905-00-259-7493
NSN 5960-01-182-3676
NSN 5990-01-386-5561
NSN 5915-00-561-6528
NSN 5835-00-785-7921
NSN 5855-01-458-0211
NSN 5920-01-297-3071
NSN 6650-01-463-8405
NSN 5935-01-535-2330
NSN 5915-01-388-6954
NSN 5920-01-142-1836