1. Professional Quality: This bimetallic hole saw is made of M42 high-speed steel, which is strong and wear-resistant. The high-speed steel saw teeth have undergone heat treatment, with a relatively high hardness (65HRC), and can be reused and are relatively durable. 2. Chip Removal Design: Pre-drilling has a good effect on chip removal and can increase the speed to some extent when removing cylindrical iron chips from the hole. 3. Easy to Use: Due to its neatly edged design, this hole saw cuts relatively easily. The spring around the drill bit will automatically push the washer out of the saw after drilling is completed. It can be used with standard adapters in most drills with SDS-plus or hexagonal chucks. 4. Wide Application: Hole saws are commonly used for materials such as wood, plastic, aluminum-plastic, non-ferrous metals, copper, and gypsum boards. They are suitable for various types of drills, including bench drills, magnetic drills, pistol drills, impact drills, etc., providing a certain degree of convenience.