A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-00-420-5744
NSN 6650-01-381-2972
NSN 5998-01-214-0590
NSN 6130-01-080-1633
NSN 5950-01-174-5305
NSN 5935-00-175-8946
NSN 5905-00-060-5518
NSN 5996-01-441-7910
NSN 6645-01-236-3494
NSN 6320-01-470-6826
NSN 6620-00-900-3986
NSN 6150-01-142-7375