A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-479-5620
NSN 5965-01-010-7428
NSN 4140-01-369-0077
NSN 6645-01-641-1575
NSN 5998-01-359-2713
NSN 5999-00-248-6984
NSN 6135-01-642-0733
NSN 6220-01-160-7247
NSN 5920-00-734-5519
NSN 6110-01-546-9082
NSN 5915-01-576-8219
NSN 5905-01-160-5385