Features 1. Multiple Adjustable Diameters: This multi-diameter adjustable 1.77-5.12 inch (45mm-130mm) woodworking drill can use a single tool to cut holes of different diameters, saving money and space. 2. Clean and Fine Cutting: Three three-tooth cutters can easily cut dry walls and cork boards, and their special straight serrations ensure clean and fine cutting. Triple cutter design, straight round effect, smooth cutting without burrs. 3. Compatible Tools: The hole saw is about 10 mm, suitable for all standard electric drills and cordless screwdrivers. 4. Multi-purpose: Widely used for woodworking openings, spotlight openings, plastic board openings, speaker openings, etc. but not for glass and metal. 5. Easy to Use: No complicated instructions for use. The stepless adjustment only needs three steps: loosen and adjust, grasp. Specification Material: Alloy Color: Blue Size: 10.8 x 14.6 x 3.5 cm Weight: 450 g Package Include: 1x Woodworking Hole Opener