3 PC Square Drive Socket Caps, Hex 7/16", 9/16" & 3/4" with 1/4", 3/8" & 1/2" Drives Hex 7/16" with 1/4" Square Drive. Hex 9/16" with 3/8" Square Drive. Hex 3/4" with 1/2" Square Drive. Chrome Vanadium Steel. Black Oxide Finish.