A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-00-884-0769
NSN 2925-01-497-9381
NSN 6320-01-389-8128
NSN 7035-01-623-7774
NSN 5990-01-106-3786
NSN 6110-01-085-0436
NSN 5985-01-055-5208
NSN 6620-01-436-5661
NSN 5905-00-358-7581
NSN 6145-01-554-3045
NSN 5935-00-845-6016
NSN 5975-00-347-9710