A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-00-468-8352
NSN 6130-00-020-1881
NSN 7035-01-350-0824
NSN 5990-01-502-8209
NSN 6650-00-784-9222
NSN 5855-01-469-7732
NSN 5910-01-334-9759
NSN 5920-00-543-1266
NSN 2925-00-845-1480
NSN 5920-01-602-0309
NSN 6320-00-070-4544
NSN 5915-01-212-9590