Features: Hard Alloy Cutting Head: Selected hard alloy material, tungsten steel heat treated, sharp and wear-resistant cutting edge, fast drilling speed. Clear Scale Cutterhead: The cutterhead scale is made using stamping technology, with clear and accurate scales, and is wear-resistant. Adjustable Opening Size: The distance from the blade to the center can be adjusted, and it can be freely adjusted by loosening the screw, making it easy and convenient. 90 Vertical Blade: The blade head and center drill are kept perpendicular to the disc, with stable positioning and no deviation, and the opening is fast and accurate. Clean and Fine Cutting: During your hole drilling to the ceiling, it can collect most of the edge debris to make you more safe and convenient during the work.with higher hardness , higher toughness, higher cutting strength, and stronger wear resistance. Wide Application Range: Used for opening materials such as wood, plastic, plywood, gypsum board, aluminum plastic board, etc. Note: cannot be used for materials such as metal, slate, ceramic tiles, and glass. Specifications: Cutter Head Quantity: 3pcs / 6pcs (Optional) Cutting Diameter: 45-130mm Cutting Thickness: 30mm Material: ABS+ alloy Item Size: 146 * 108 * 35 mm / 5.75 * 4.25 * 1.38 inch Package Size: 25.5 * 18.5 * 4 cm / 10.04 * 7.28 * 1.57 inch Package Weight: 3Pcs: 450g / 15.87oz 6Pcs: 465g / 16.4oz Package List: 1 * Cutting Disc 1 * Adjustment Dial 1 * L Type Small Wrench 1 * Nut 1 * Bit 3 * Cutter Head / 6 * Cutter Head (Optional)