A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-00-275-0826
NSN 5975-00-361-7793
NSN 6105-01-034-4923
NSN 5895-00-899-0334
NSN 5999-01-121-1194
NSN 5990-00-337-5359
NSN 5996-01-167-3205
NSN 6110-01-602-5670
NSN 6610-01-322-1394
NSN 5996-01-150-2800
NSN 5990-01-187-8594
NSN 6105-01-142-3199