Professional Quality: The bi-metal hole saw is made of premium M42 high-speed steel, providing strength and abrasion resistance. The high-speed steel teeth are heat-treated to achieve high hardness (65HRC), ensuring durability and reusability. The chip removal design allows for efficient evacuation of chips, improving performance when removing cylindrical material from the hole. Easy to use with clean cutting edges that enable smooth and effortless operation. The spring mechanism automatically ejects the washer once the hole is complete. Compatible with standard adapters for use in drills with SDS-plus or hexagonal chucks. Wide Applications: Suitable for cutting wood, plastic, aluminum, non-ferrous metals, copper, and plasterboard. Can be used with magnetic drills, hammer drills, and other compatible power tools. Convenient and reliable for professional and DIY use.