A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-420-9876
NSN 7035-01-088-6415
NSN 6145-01-462-5930
NSN 5930-01-026-9937
NSN 5920-00-187-0260
NSN 6105-01-625-2548
NSN 6645-01-155-3966
NSN 6645-00-989-2972
NSN 5990-00-952-7100
NSN 5935-01-348-8621
NSN 6220-01-487-7079
NSN 6650-00-518-5194