Features 1、It can work with standard chucks of 9mm diameter. 2、Small tip includes clearance hole for screw shank 3、Large diameter creates flat-bottomed hole 4、Recommended for use with corded high-rpm drills 5、Perfect for use with pocket hole guides Specification Features: It can work with standard chucks of 9mm diameter. Small tip includes clearance hole for screw shank Large diameter creates flat-bottomed hole Recommended for use with corded high-rpm drills Perfect for use with pocket hole guides Come with wrench and limit ring Specification: Big head diameter: 9mm Small head diameter: 4.2mm Purpose: used for drilling wood Package list: 1 * bit 1 * small wrench 1 * location ring Package List