Multiple Adjustable Diameters: This multi-diameter adjustable 4.5-5.5 inch woodworking 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 can easily cut dry walls and cork boards, and their special straight serrations clean and fine cutting. Triple cutter design, straight round effect, cutting without burrs. Multi-: 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 drills and cordless screwdrivers. Note: The cordless screwdriver is only suitable for drywall drilling, while the electric drill can be used for drywall, oriented strand board, cork, plywood, etc. Cutting Depth: 30mm/1.18in Shaft Diameter: 8.5mm/0.33in Shaft Length: 25mm/0.98in Product diameter: about 15.5cm/6.10in Adjustable range:45mm-130mm/1.77-5.12in Colour: Material:Metal Size:146mm Package Contents: 1 x Hole Opener Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.