The Punching Saw with adjustable diameters from 45mm to 130mm, which makes it possible to cut holes of different diameters with just one tool, saving money and space. The three triple tooth blades can saw through plasterboard and softwood boards, and fine and clean cuts with their special, straight saw tooth. Triple blade design ensures smooth cut, and burr-free. Loosen the middle 3 screws, then adjust the diameter of the hole you want, and finally tighten the 3 screws to start drilling. Round holes of different sizes and diameters require only one drill bit. It is a very practical tool for , home decorators, contractors, and DIY owners for embedded lights, ceiling speakers, vents and other hole cutting applications. Cutting depth: 30mm, shaft diameter: 8.5mm, shaft length: 25mm, product diameter: 15.5cm. The package includes adjustable punching saw, replacement blades, positioning bit (use range 0.6cm), and hexagon socket wrench. Color: Silver Product size: 15.5 cm Product weight: 466g Colour:As Shown Material:Metal Package Contents: 1 x Adjustable Punch Saw Tool for Drilling 3 x spare blades 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.