A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-065-5620
NSN 5985-00-071-1401
NSN 5996-00-155-6904
NSN 5855-00-610-4052
NSN 5950-01-381-6393
NSN 6685-01-409-2748
NSN 5930-01-288-5170
NSN 6645-01-583-8153
NSN 5960-00-615-9972
NSN 6135-01-599-7563
NSN 7035-00-585-2113
NSN 6610-01-531-6311