A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-00-016-0071
NSN 6620-01-037-4631
NSN 2925-01-445-4095
NSN 5920-00-601-2390
NSN 6320-00-194-4252
NSN 6110-01-354-4774
NSN 5990-01-463-5400
NSN 6620-01-655-7664
NSN 5910-00-404-2124
NSN 5930-00-150-6471
NSN 5960-01-512-0233
NSN 5895-01-159-2089