A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-204-2922
NSN 4140-01-399-0330
NSN 6610-00-411-7246
NSN 6240-00-023-9238
NSN 5835-01-416-6455
NSN 5915-00-176-2548
NSN 6240-01-208-0401
NSN 6105-00-252-0323
NSN 6620-00-240-8766
NSN 7035-00-465-3298
NSN 5915-01-314-7313
NSN 7035-00-574-4223