A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-00-915-6313
NSN 5920-01-307-1439
NSN 5935-00-276-9399
NSN 5920-01-096-8815
NSN 5975-01-254-2851
NSN 5960-01-025-2526
NSN 4140-00-469-6995
NSN 5950-01-022-9989
NSN 5998-01-430-3115
NSN 2925-01-480-8273
NSN 5905-01-224-3600
NSN 5960-01-025-2526