A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-00-255-3674
NSN 5985-01-462-4435
NSN 5895-01-476-7247
NSN 5930-01-153-0961
NSN 6105-00-232-1410
NSN 5935-00-501-5817
NSN 5990-01-400-3299
NSN 6220-01-288-3058
NSN 5950-01-595-5647
NSN 6145-00-785-4112
NSN 5960-01-641-5493
NSN 5925-00-080-9763