A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 7035-00-834-2090
NSN 5985-01-448-9550
NSN 5930-01-598-1402
NSN 6650-00-202-4540
NSN 6130-00-239-5988
NSN 5895-00-643-3980
NSN 5920-00-030-0330
NSN 5950-00-983-8678
NSN 5996-00-508-0383
NSN 5915-01-648-2126
NSN 6105-00-596-6107
NSN 6135-00-455-2425