【Adjustable Plane-Type Design】The adjustable circle hole cutter will make clean cuts from 30mm to 300mm in diameter. 【Fast and Accurate】The alloy steel beam features marked graduations for quick measurement and accurate cutting. 【Round and Round】Double-blade design, straight round effect, smooth and burr-free cutting. 【Used for】Widely used in woodworking opening, spotlight opening, plastic plate opening, DIY speaker opening, etc. Adjustable Circle Hole Cutter Two interchangeable tips for thinner or thicker materials freely. Can be used in woodworking opening, spotlight opening, plastic plate opening, DIY speaker opening, etc. Sturdy Construction Long Lasting Sturdy woodworking 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 Fast and Accurate The alloy steel beam has marked graduations for quick measurement and accurate cutting. Size: 30-300mm Diameter Adjustable Plane-Type Design Make clean cuts from 30mm to 300mm diameter, multi-functions meet your needs. Applied Materials Application 1. Suitable for: Solid wood, Denisty board, MDF, plywood, laminates, composite, rubber, plastic and more. 2. Not applicable to: Metal, glass. Package includes 1 x Adjustable Hole Saw Notice 1. When drilling the hole, the two sides should be equal in distance. 2. Adjust the required size, make 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, can only perform vertical drilling from top to bottom. 5. Please do not use on steel sheets or other metals.