A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-036-4951
NSN 5915-01-565-8955
NSN 5996-01-026-9981
NSN 6320-00-110-8005
NSN 5990-00-607-0117
NSN 6645-01-242-9240
NSN 2925-01-471-3365
NSN 5935-01-411-2610
NSN 6220-01-235-6896
NSN 5920-01-333-6235
NSN 6135-01-010-0891
NSN 6620-01-642-4218