Features:Multiple Adjustable Diameters: This multi-diameter adjustable 4.5-5.5 inchwoodworking drill can use a single tool to cut holes of different diameters, saving money and space.Easy to Use: No complicated instructions for use. The stepless adjustment only needs three steps: loosen and adjust, grasp.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.Multi-purpose: Widely used for woodworking openings, spotlight openings,plastic board openings, speaker openings, etc. but not for glass and metal.Compatible Tools: The hole saw is about 10 mm, suitable for all standard electric.