A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-183-2890
NSN 6620-01-407-5619
NSN 6150-01-552-1319
NSN 5975-01-123-9111
NSN 6320-01-462-2295
NSN 6220-01-531-1402
NSN 6645-01-570-3215
NSN 5999-00-309-7373
NSN 5835-01-048-8106
NSN 5985-01-091-6831
NSN 5935-01-044-7177
NSN 5999-00-008-8623