A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-451-8174
NSN 6105-00-159-7801
NSN 5975-00-529-3835
NSN 5999-01-502-9773
NSN 6620-00-317-7820
NSN 6320-01-232-4664
NSN 6220-01-147-5320
NSN 2925-01-437-9041
NSN 5990-01-503-6104
NSN 6105-01-312-2373
NSN 6610-01-397-1621
NSN 7035-01-135-7783