A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-579-7000
NSN 6320-01-411-1353
NSN 5855-01-145-4903
NSN 6135-00-643-4843
NSN 6220-01-429-2852
NSN 6240-01-266-3655
NSN 5930-01-418-9569
NSN 6240-01-379-9545
NSN 7035-00-225-6499
NSN 6130-01-446-8758
NSN 6645-01-227-2036
NSN 5920-01-360-5681