A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-064-2937
NSN 6220-00-079-2943
NSN 6240-01-659-7533
NSN 5950-01-354-7553
NSN 6220-01-202-8855
NSN 6220-01-202-6792
NSN 5945-01-607-0482
NSN 5960-01-233-6124
NSN 6220-00-208-9058
NSN 5996-01-650-5762
NSN 6650-01-275-5469
NSN 5910-01-509-0292