Feature 1. Suitable for most general purpose drills 2. Efficient and accurate positioning 3 Double face with exhaust sawdust design 4. There are 7 high-quality replacement drill bits: when the drill bit is damaged, only need to replace the drill bit that can continue to be used. Package Included 7x Center Drill (5/64", 7/64", 9/64",11/64'', 13/64'', 5mm and 1/4") (with shell) 7x Replace the drill bit 1x hex wrench