A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-076-7671
NSN 6645-01-421-4007
NSN 6620-01-182-9947
NSN 6610-01-227-7221
NSN 4140-00-126-4685
NSN 6130-00-660-8848
NSN 5935-01-467-9194
NSN 5915-01-188-8314
NSN 6610-00-518-4919
NSN 5990-01-534-8609
NSN 6135-01-633-8502
NSN 5895-01-300-3427