A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-080-2875
NSN 6105-01-548-7280
NSN 6110-01-306-9235
NSN 5935-01-231-9359
NSN 2925-01-444-2061
NSN 5945-01-229-5247
NSN 6620-00-066-1284
NSN 5999-01-504-6541
NSN 5950-01-103-9610
NSN 5915-01-141-6726
NSN 5990-01-658-9964
NSN 6645-01-287-7348