A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-00-561-0380
NSN 5945-01-534-2447
NSN 6110-01-578-2010
NSN 6620-00-406-2914
NSN 6620-01-215-0470
NSN 5920-01-076-4705
NSN 5855-00-114-4954
NSN 6610-01-312-8340
NSN 6130-01-338-3707
NSN 6240-00-484-8148
NSN 6320-00-483-0451
NSN 6110-01-047-3903