A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-186-7314
NSN 5945-01-249-0931
NSN 6110-00-297-5768
NSN 5925-00-251-3283
NSN 5950-00-353-1421
NSN 5920-01-054-7230
NSN 5905-01-070-0669
NSN 6320-01-569-2672
NSN 2925-01-436-7325
NSN 6145-01-646-7595
NSN 6610-00-186-9180
NSN 6645-00-760-5599