A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-394-5650
NSN 6685-01-101-7495
NSN 5920-01-336-8998
NSN 4140-01-430-1863
NSN 6320-01-239-1240
NSN 5835-01-281-7281
NSN 5935-00-332-0016
NSN 6645-00-155-2398
NSN 5935-01-620-3939
NSN 5905-01-178-0155
NSN 5996-01-138-0281
NSN 6610-01-541-0880