A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-00-536-0260
NSN 5920-00-331-0583
NSN 2925-00-138-5542
NSN 5930-00-269-2594
NSN 6320-00-731-6134
NSN 5925-01-320-2498
NSN 5950-01-470-2938
NSN 6220-01-079-2029
NSN 5998-00-905-7385
NSN 5910-00-031-6812
NSN 7035-01-392-3097
NSN 5945-01-651-8654