Features: Versatility in Diameter Adjustment: Save both money and workspace with this innovative drill, which allowing you to cut holes of various diameters with a single tool. Perfect for projects requiring multiple hole sizes. Effortless Operation: Simplify your woodworking tasks with its user-friendly design. The stepless adjustment mechanism requires just three intuitive steps: loosen, adjust, and grasp. No complicated instructions needed, making it a breeze to operate. Precise and Clean Cutting: Equipped with three precision-crafted three-tooth cutters, this drill effortlessly slices through drywalls and cork boards. Its unique straight serrations guarantee a clean, fine cut every time, leaving behind a smooth, burr-free surface. Broad Application Range: Ideal for a wide array of projects, this versatile drill is perfect for woodworking openings, spotlight cutouts, plastic board holes, speaker openings, and more. However, please note that it's not suitable for drilling through glass or metal. Compatible with standard electric drills and cordless screwdrivers, it's a must-have for any DIYer or professional woodworker. Specifications: Adjustable range: 45mm-130mm/1.77-5.12in Size: As picture show Package Included: 1pcs Hole Opener