A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-00-223-2686
NSN 5965-01-248-9705
NSN 5895-00-574-0287
NSN 5996-01-266-5973
NSN 5999-01-622-7193
NSN 6320-00-284-1524
NSN 5930-01-614-3216
NSN 7035-01-311-8424
NSN 5855-01-059-2710
NSN 5960-00-420-0418
NSN 2925-01-489-1394
NSN 5999-01-650-8532