SUPERIOR QUALITY MATERIALS: The engravings are made of YG8 carburetor steel with a hardness of Variable. The hole saw is equipped with a twist drill, which has a sharp edge, high strength, high precision and a particularly smooth cut. Resistant to shocks and vibrations. Abrasion. Suitable for cordless drills, handheld drills, bench drills, electric drills, etc. INTELLIGENT CONCEPT: 64HRC blade figures 65HRC, each set of blades and process responsibilities. 13 different shanks: 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 53mm. Size chuck width: 10mm Application: It is an ideal complement to machine tools, suitable for use in machine tools. • stainless steel, metal, iron plastic, etc. aluminum, fiberglass, etc. For safety reasons, please wear goggles and gloves when using our hole saw set, when adding coolant during continuous high-speed drilling. high speed.