A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-01-211-2437
NSN 6320-01-389-8128
NSN 5905-01-391-5673
NSN 5998-00-581-3867
NSN 6620-00-538-8746
NSN 5999-01-027-0177
NSN 5999-00-242-0529
NSN 5990-01-205-5937
NSN 6320-00-004-9158
NSN 7035-01-493-9487
NSN 5965-01-090-6245
NSN 6320-01-116-3980