BER1363 US PRO 3pc POWER DRILL SOCKET ADAPTERS Set of three hex to square drive adaptors. Converts any 1/4 inch hexagon drive or drill chuck to accommodate 1/4, 3/8, or 1/2 inch drive sockets. Contains: 1/4, 3/8 and 1/2 in square drive 1/4" x 65mm 3/8" x 65mm 1/2" x 73mm