10 SELECTABLE HOLE DIAMETERS: 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm – provides solutions for various hole size requirements. HEAT-TREATED M42 HSS BI-METAL HOLE SAW: Constructed from high-speed steel and bi-metal alloy with sharp cutting edges and high hardness. Durable and long-lasting. Precision concentricity ensures even tooth distribution, enhancing tool life. CUTTING DESIGN: Features a non-binding clean edge design for smooth and efficient cutting. The spring-loaded pilot bit automatically ejects the core after drilling for quick removal. APPLICATION: Suitable for cutting mild steel, stainless steel, cast iron, brass, aluminum, and wood. Ideal for installing locks, knobs in doors and cabinets, or drilling large-diameter holes in desks and other materials. A must-have tool for carpentry and home improvement projects. USAGE SUGGESTIONS: - Use cutting fluid during operation to prevent overheating and extend tool life. - Maintain a stable drill to avoid excessive vibration that may damage the center bit. - Begin drilling at a low speed to prevent initial impact damage to the center bit. - For larger hole saw sizes, use slower rotational speeds to protect the center bit from breakage.