A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-437-4135
NSN 5910-00-170-8271
NSN 5985-00-472-7770
NSN 6320-01-088-1109
NSN 6105-01-072-8081
NSN 6220-01-495-3301
NSN 2925-01-029-0467
NSN 6320-01-396-2080
NSN 6145-00-042-3800
NSN 5950-00-865-3824
NSN 6645-00-938-2173
NSN 4140-01-474-7950