Hole Drill Bit Straight Serrated Serration Straight Round Effect Universal Adjustable Punch Cutting Machine Feature:1. Adjustable Diameter and Space Saving: This wood drill has various adjustable diameters from 45-130mm. Cut holes of different diameters with only one tool, saving money and space2. Fine and Cutting: The three three-toothed blades can easily cut through drywall and cork boards, and their special straight serrated serrations ensure fine and clean cuts. Triple blade design, has straight round effect, cutting, no burr3. Easy to use: no complicated instructions for use. Loosen the 3 screws in the middle, then adjust the desired hole diameter, and finally tighten the 3 screws to start drilling4. Suitable scene: This cutter is specially designed for cutting solid board, compressed board, drywall, plastic etc. Suitable for home projects. Widely used for woodworking holes, holes, plastic plate holes, DIY speaker holes, etc., but not suitable for glass and metal5. Compatible tools: All standard drills and cordless screwdrivers accept 10mm cutters. Cordless screwdrivers are only suitable for drilling drywall, and electric drills can be used for drywall, OSB, cork, plywood, etc. Specification: Item type: adjustable cutter Material: ABS, aluminum alloy, carbon steel Diameter that can be Drill: Approx. 45 ~ 130mm / 1.77 ~ 5.12in Package List: 1 x Adjustment Plate 3 x Saw Head 1 x Center Drill 4 x Screw 2 x Hex Wrench How to use: Install the saw head and center drill at the appropriate position on the adjustable disc and you can use it.