A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-541-6481
NSN 5975-01-065-4863
NSN 5915-00-671-9223
NSN 5920-00-054-3381
NSN 6110-01-182-2340
NSN 6135-00-369-2368
NSN 5910-01-039-0487
NSN 5998-00-920-1286
NSN 5915-01-165-7409
NSN 6110-00-838-0492
NSN 7035-00-076-4097
NSN 5999-01-051-3390