A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-618-1201
NSN 5999-01-589-1637
NSN 6320-01-194-1253
NSN 5996-01-383-7018
NSN 6135-01-255-9129
NSN 6145-01-344-4268
NSN 5990-01-009-3634
NSN 2925-01-424-0235
NSN 6650-01-371-3551
NSN 7035-00-535-8109
NSN 6110-00-477-9677
NSN 5895-00-882-3309