A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-063-8042
NSN 6620-01-389-3324
NSN 5960-01-261-6753
NSN 5985-01-514-9811
NSN 5835-01-370-4292
NSN 6110-00-418-8106
NSN 5910-01-126-7152
NSN 5996-01-057-1981
NSN 6220-01-337-2933
NSN 5925-01-542-4124
NSN 5915-01-633-9845
NSN 5855-01-275-5470