A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-00-170-3623
NSN 5935-01-605-0222
NSN 5975-01-442-5191
NSN 5855-01-629-4831
NSN 2925-01-464-3093
NSN 5999-01-616-7504
NSN 6130-00-375-5902
NSN 6240-01-036-5063
NSN 6130-00-882-9330
NSN 4140-01-080-8268
NSN 5945-01-443-3423
NSN 6110-01-104-4299