Features: 1. The cutting edge is made of high-grade cemented carbide, cutting sharply, making the rotation stable. 2. Aircraft-type hole openers can be used for drilling holes on plastic, wood, gypsum board, plywood and other materials. They are often used for speakers, spotlights, woodworking, plastic board drilling, etc., and are used with bench drills, drill presses, and various hand drills. 3. Adjustable round hole cutter: The adjustable round hole cutter can effortlessly cut the perfect circle, giving you a fast, convenient and stable cutting effect. 4. Fast and accurate cutting machine: The hole sawtooth kit is scaled in metric size, just select the required scale and align the inner edge of the cutter holder with the size scale. Alloy steel beams have marked graduations for fast measurement and precise cutting. 5. Tool bit use: widely used in woodworking openings, spotlight openings, plastic plate openings, DIY speaker openings, etc. Perfect for drilling of woodworking, laminate, plastic, acrylic, plywood, composite, plaster, rubber and cardboard. Notice: Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Description: Material: allloy Size: As the picture shown Battery: No Color/Style: As the picture shown includes: 1 x Drill Bit Cutter