A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-203-5543
NSN 6135-01-128-5358
NSN 6130-01-604-0233
NSN 2925-01-430-4206
NSN 5905-01-444-5236
NSN 6150-01-098-6405
NSN 6145-01-007-0580
NSN 6105-01-199-0201
NSN 7035-00-946-2642
NSN 5999-00-422-5397
NSN 5915-01-209-2788
NSN 5950-01-542-0835