Adjustable plane design Adjustable hole cutter allows clean cuts up to 300mm in diameter. Fast and precise alloy steel beams feature marked scales for quick measuring and precise cutting. Round double blade design, straight round effect, smooth cutting without burrs. It is widely used in carpentry openings, spotlight openings, plastic plate openings, DIY speaker openings, etc. Adjustable Round Hole Cutter Two interchangeable drill bits, free to cut thinner or thicker materials. It can be used for carpentry openings, floodlight openings, plastic plate openings, DIY speaker openings, etc. Sturdy, Durable Construction Sturdy wood construction with durable black oxide finish for extended tool life. Sleek alloy blades, adjustable double blade design, straight round effect, smooth cutting without burrs. Uniform, Fast and Accurate Graduation Alloy steel beams feature marked scales for fast measuring and accurate cutting. Size : 30 to 300 mm in diameter. Adjustable machine design to achieve a clean cut from 30mm to 300mm diameter. Multifunctional to meet your needs. Material application 1. Applicable to: solid wood, density board, MDF, plywood, laminate, composite materials, rubber, plastic, etc. 2. Not suitable for: metal, glass. Package Contents: 1 x adjustable hole saw Note 1. When drilling, the distance on both sides should be equal. 2. Adjust to the required size and be sure to tighten the screws with a hex wrench. 3. The drilling speed should be slow, and the drilling materials should not contain iron, nails or other metals. 4. You cannot drill holes backwards on the ceiling, you can only drill holes vertically from top to bottom. 5. Do not use on steel plates or other metals.