A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-00-930-1249
NSN 5965-00-513-1352
NSN 6650-00-005-2145
NSN 5999-01-253-5646
NSN 6105-01-182-2201
NSN 5985-01-533-3398
NSN 5910-00-795-9655
NSN 5945-00-262-2968
NSN 5915-01-565-9261
NSN 6135-01-128-5358
NSN 6105-01-619-1646
NSN 6610-01-495-0596