A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-174-9094
NSN 5999-01-532-8063
NSN 5999-00-842-0824
NSN 5920-00-493-8307
NSN 5905-00-174-3732
NSN 6650-00-960-5040
NSN 5985-00-277-7371
NSN 6645-01-484-9847
NSN 5905-01-607-0118
NSN 5930-01-365-4144
NSN 5945-00-329-4825
NSN 5985-01-510-4684