A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-540-4885
NSN 5960-01-204-5820
NSN 7035-00-312-3055
NSN 5930-00-673-9928
NSN 5950-01-556-3064
NSN 5855-01-660-5088
NSN 5855-00-149-0766
NSN 6105-00-181-0678
NSN 6685-00-862-0979
NSN 4140-00-597-5260
NSN 6135-01-071-4923
NSN 5855-00-548-4742