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 a hardness of 65HRC, ensuring durability and reusability. The chip removal design allows efficient evacuation of chips, improving performance when removing cylindrical material from the hole. Easy to Use: Featuring clean edges for smooth cutting, this hole saw delivers effortless operation. The spring mechanism automatically ejects the center washer once the hole is complete. Compatible with standard adapters for use in drills with SDS-plus or hexagonal chucks. Wide Applications: Suitable for use in wood, plastic, aluminum, non-ferrous metals, copper, and plasterboard. Can be used with magnetic drills, hammer drills, and other common drill types. Convenient and reliable for professional and DIY applications.