A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-524-7411
NSN 5935-01-412-0643
NSN 5935-00-335-8538
NSN 5915-00-152-7517
NSN 6650-01-433-3520
NSN 5999-01-091-9637
NSN 5960-00-382-6012
NSN 5930-01-334-8177
NSN 5920-01-066-3709
NSN 6150-00-316-3223
NSN 6240-01-281-4153
NSN 5985-00-636-8689