A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-414-9801
NSN 5990-00-247-0975
NSN 5855-01-400-1590
NSN 6610-01-598-0950
NSN 5996-01-433-2253
NSN 5925-01-424-2554
NSN 5999-00-489-7171
NSN 5935-01-513-9982
NSN 5835-01-045-3371
NSN 7035-00-205-8739
NSN 7035-01-633-9537
NSN 5915-00-968-7515