A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-106-9892
NSN 6320-01-504-3948
NSN 5965-00-961-1627
NSN 5999-01-185-0370
NSN 6150-00-918-7139
NSN 6650-00-299-1839
NSN 6610-01-514-0745
NSN 5975-00-424-3403
NSN 5950-01-448-1771
NSN 6145-01-617-1118
NSN 6610-01-633-8931
NSN 5915-01-080-1397