DeWalt's Extreme series Tri-Flute bits are impact rated with 1/4" hex shanks, making them suitable for use in impact drivers as well as all standard drills with a jawed chuck. They can be used for drilling holes up to 100mm deep into wood with corded and cordless machines. Specifications • Drilling Diameter: 18mm • Total Length: 152mm Please note 13mm bit is shown for illustration purposes only. Features and Benefits • 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