A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-528-7152
NSN 5855-01-562-0329
NSN 6145-01-622-9961
NSN 5905-01-141-6633
NSN 6220-00-850-6553
NSN 7035-00-264-7543
NSN 6150-01-509-2352
NSN 6320-00-483-0451
NSN 6685-00-959-4089
NSN 6145-01-083-4203
NSN 5999-01-260-7507
NSN 5895-01-102-6828