A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-251-8663
NSN 7035-01-013-9889
NSN 5960-00-376-0277
NSN 6130-01-514-1027
NSN 6320-00-228-5678
NSN 5910-01-040-3189
NSN 6240-01-163-2813
NSN 5935-00-276-9413
NSN 6685-00-770-2052
NSN 6220-01-227-1917
NSN 2925-01-567-8027
NSN 5915-00-054-0924