This adjustable hole cutter is designed for creating clean holes in materials such as wood, plastic board, gypsum board, PVC sheet, glass, and porcelain. It is compatible with any variable speed drill and includes a round-tipped bit for use at lower RPM. The tool features two adjustable blades that allow for precise hole diameter adjustments from 30mm to 200mm. Ensure both blades are evenly adjusted before use to maintain balanced cutting force. After adjusting to the desired size, secure the blades by tightening the screws with the included hex wrench. Do not use on steel or other metal surfaces. Drilling should be performed at a slow speed, and the material must not contain iron, nails, or any metal components. The hole cutter is constructed from metal and has a black finish. Package includes: 1 x hole punching tool. Other items shown are not included. Note: Color may vary slightly due to lighting and display settings. Measurement may vary by +/- 1-3 cm.