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Heat treated M42 bi-metal hole saw: Made of high quality HSS carbon steel & Bi-metal steel with sharp edges and high hardness. Rust-proof, wear-resistant and long usage life. Rapid drilling: With the non-binding clean edge design, this hole saw cuts smooth and easy. Impact resistant, sharp teeth, low vibration, quick drilling, increased drilling efficiency. Equipped with a center connecting rod: For your convenience, we have a center connecting rod for you. Simple and quick to assemble. Application: Suitable for Pistol Drill, Bench Drill, Vertical Drilling Machine etc. Widely used in Plate Hole, Home Wood, Galvanized Pipe, Fire Pipe, Plastic, Gypsum Board and Other Opening Operation. 20 Electable hole diameters: 38-114MM, Solutions to all dimensions of the problem.