Overview: 1-Various Adjustable Diameters This woodworking hole driller with adjustable multi diameters from 45mm to 130mm, makes it possible to cut holes of different diameters with just one tool, saving money and space. 2-Fine & Clean Cuts Thethree triple tooth bladessaw through plasterboard and softwood boards with ease, and ensure fine and clean cuts with their special, straight-set toothing. Triple blade design, straight round effect, smooth cut, and burr-free. 3-Easy To Use No complex instructions for use. The infinitely adjustable in just three steps: Loosen; Adjust Simultaneously; Fasten. 4-Multiple Use Widely used in woodworking opening, spotlight opening, plastic plate opening, DIY speaker opening, etc, but not for glass and metal. 5-Compatible Tools The hole saw is 10mm acceptable for all standard power drills and cordless screwdrivers. Attention:The cordless screwdriver is only suitable for drilling on gypsum plasterboard, while the power drill can be used on gypsum plasterboard, OSB panel, softwood, plywood and more.