A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-00-940-8374
NSN 5990-00-444-9993
NSN 5895-00-827-0240
NSN 5915-01-633-9845
NSN 6145-00-087-8745
NSN 5855-01-045-9728
NSN 6645-01-417-1913
NSN 5895-00-165-1289
NSN 5935-01-187-8553
NSN 5975-00-084-5264
NSN 6150-00-186-7809
NSN 6685-01-455-7373