A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-246-4285
NSN 5855-01-141-8227
NSN 6645-01-367-8911
NSN 6150-01-477-8853
NSN 5999-01-399-8726
NSN 5895-00-026-1749
NSN 5855-00-779-2854
NSN 5985-00-526-0154
NSN 7035-00-470-4977
NSN 6105-00-899-0415
NSN 6105-01-377-6284
NSN 6145-01-466-9487