A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-204-5697
NSN 5975-01-197-0996
NSN 5930-00-053-8674
NSN 6145-01-568-1832
NSN 6130-01-446-9114
NSN 6645-01-352-5675
NSN 5990-00-104-4903
NSN 7035-00-572-7086
NSN 5910-01-461-9038
NSN 6240-01-516-2919
NSN 5950-01-625-8494
NSN 6220-01-300-1653