DEWALT DT90293-QZ 18mm x 152mm Tri-Flute Spade Bit · · · Impact rated: suitable for use with impact drivers · · Quick-change 1/4″ hex shanks suitable for use in a wide range of machines · · Tri-flute tapered design for faster removal of wood chips with less binding · · Three cutting spurs for cleaner, faster holes with extended drilling life · · Full screw tip allows bit to self-feed for ease of use