A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-400-3880
NSN 5930-01-532-7928
NSN 6650-01-570-6094
NSN 5930-01-357-1613
NSN 5996-01-422-8103
NSN 5925-01-130-0613
NSN 6145-00-350-6657
NSN 5855-01-163-8152
NSN 6145-01-574-5130
NSN 6620-01-195-3355
NSN 6240-01-659-3499
NSN 5950-01-470-1086