A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-442-5699
NSN 5996-00-016-7067
NSN 5999-00-394-4540
NSN 6105-01-460-5065
NSN 6130-01-481-1193
NSN 6320-01-021-6633
NSN 6645-00-173-2800
NSN 5905-01-023-8416
NSN 5950-01-186-2532
NSN 5905-00-687-2121
NSN 6135-01-461-2915
NSN 5930-00-758-7206