Versatile - With the wood hole saw you can drill plywood, wood, plasterboard, acrylic, fiber cement boards, etc. Adjustable diameter - The adjustable bell drill is suitable for drilling holes with a large diameter (from 30 mm to 120 mm) in order to be able to mount spotlights or built-in speakers, for example. Material - - The adjustable drill is made of chrome steel - vanadium, corrosion-resistant, corrosion-resistant. Resistant, resistant to bending and reusable after grinding. Advantage - - The tool offers a real advantage in terms of adjusting the drilling diameter, thus avoiding the accumulation of hole saws. Note - - Before drilling, make sure that the two pins are set to the same diameter and that the initial rotation speed is not too high. Product Description Features: For drilling plywood, plasterboard, acrylic, fiber cement boards, etc. Ideal for air conditioning pipes, fans, bright ceiling lights, speakers recessed into the ceiling Allows you to drill holes with a depth of