A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-642-0533
NSN 5996-01-410-8538
NSN 6685-01-005-0325
NSN 6145-01-512-8688
NSN 6220-01-210-7193
NSN 5855-00-198-3197
NSN 6620-01-514-7786
NSN 4140-00-249-5603
NSN 6220-01-613-1515
NSN 4140-00-219-3146
NSN 5930-01-100-2682
NSN 5920-01-452-2809