A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-01-180-5097
NSN 5915-01-448-9228
NSN 6320-01-462-2295
NSN 6220-01-426-4696
NSN 6220-01-113-8861
NSN 6620-00-155-2608
NSN 6650-00-334-3564
NSN 5925-01-168-1801
NSN 6105-01-612-3390
NSN 6645-01-361-4813
NSN 6650-01-333-9155
NSN 5999-00-099-6889