Description Description Adjustable Airplane Type DesignAdjustable circle hole cutter will make clean cuts from 30mm to 300mm in diameter. Fast and AccurateAlloy steel beam features graduations marked for quick measurement and precise cutting. Round and roundDouble blade design, straight round effect, smooth and burr-free cutting. Used forWidely used in, carpentry opening, spotlight opening, plastic plate opening, DIY speaker opening, etc. Adjustable circular hole cutter Two interchangeable tips for thinner or thicker materials freely. Can be used in carpentry opening, projector opening, plastic plate opening, DIY speaker opening, etc. . Heavy Duty Construction Long Lasting Sturdy wood construction, durable black oxide finish for long tool life. Alloy blade Round and smooth Adjustable double blade design, straight round effect, smooth and burr-free cutting. Uniform scale Quick and precise The alloy steel beam features marked graduations for quick measuring and precise cutting. Size:30-300mm diameter Adjustable aircraft type design Make clean cuts from 30mm to 300mm in diameter, multi-functions meet your needs. Materials Applied Application 1. Suitable for: solid wood, Denisty plate, MDF, plywood, laminates, composite, rubber, plastic and more. 2. Not applicable: metal, glass. Package includes 1 x adjustable hole saw Notice 1. When drilling the hole, both sides should be equal in distance. 2. Adjust the required size, be sure to use the hex wrench to tighten the screws. 3. The drilling speed should be slow and the drilling material should not contain iron, nails or other metal. 4. Cannot drill the hole backward in the ceiling, only can do vertical drilling up and down. 5. Please do not use on sheet steel or other metals.