A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-114-8099
NSN 6685-01-627-7727
NSN 5945-01-222-0318
NSN 7035-01-337-1729
NSN 5935-01-084-3882
NSN 6610-00-483-2073
NSN 6130-01-557-5387
NSN 6650-00-451-8174
NSN 5925-01-372-0863
NSN 5895-01-185-2981
NSN 5925-01-197-9899
NSN 5985-01-627-6691