Professional Quality: The bi-metal hole saw is made of premium M42 high-speed steel, ensuring strength and abrasion resistance. The high-speed steel teeth are heat-treated to achieve high hardness (65HRC), offering durability and reusability. The chip removal design facilitates efficient evacuation of chips, enhancing performance when removing cylindrical material from holes. 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 efficiency. Compatible with standard adapters for use in drills equipped 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 various power tools including magnetic drills, hammer drills, and handheld drills. Practical and reliable for professional and DIY applications.