A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-462-4242
NSN 5935-00-698-4124
NSN 5925-01-322-7930
NSN 5975-00-119-1486
NSN 4140-01-363-2258
NSN 5945-01-580-0107
NSN 5935-00-051-6536
NSN 6320-01-232-4664
NSN 6130-00-352-2317
NSN 7035-00-312-3055
NSN 5855-00-610-4052
NSN 6110-01-476-9617