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 facilitates efficient evacuation of chips, enhancing performance when removing cylindrical material from the hole. Easy to Use: Designed with clean edges for smooth cutting action, this hole saw delivers effortless operation. The spring mechanism automatically ejects the center washer once the hole is completed, improving convenience and speed. Compatible with standard adapters for use in drills equipped with SDS-plus or hexagonal chucks. Wide Applications: Suitable for cutting wood, plastic, aluminum, non-ferrous metals, copper, plasterboard, and similar materials. Can be used with magnetic base drills, handheld drills, hammer drills, and other common drilling tools. Practical and reliable for various professional and DIY applications.