A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-00-689-7815
NSN 5930-01-550-3572
NSN 5925-01-050-8195
NSN 6685-01-443-6699
NSN 5999-00-971-5640
NSN 6240-01-399-0343
NSN 5930-00-268-8107
NSN 7035-01-492-6799
NSN 6220-00-274-8541
NSN 5950-01-215-3180
NSN 7035-00-009-8705
NSN 5965-01-451-7313