A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-347-0201
NSN 5985-01-279-4179
NSN 5965-01-521-4452
NSN 6150-01-012-1409
NSN 5935-01-012-7960
NSN 7035-00-800-0770
NSN 5960-00-905-8020
NSN 6130-01-467-7907
NSN 7035-01-203-8010
NSN 5935-00-919-2076
NSN 5985-00-189-0599
NSN 6105-01-239-7626