1. Carbide hole saw cutter is extremely long lifetime, especially designed to cut alloy and stainless steel materials. 2. Quick, precise, smooth cuts into up to 5mm thick material like stainless steel, high alloy steel, aluminum, plastic, FRP and PVC. 3. The hole saw has a twist drill bit inside, which is detachable. Come with a hex wrench, make your job more convenient and easier. 4. Protect carbide teeth from impacting when the pilot drill bit through the cutting material. 5. Suitable to be installed onto hand held drill, table mounted drill, or other drills. Used for 10mm professional electric drill provides excellent performance, here is not included. 6. Attention: The hole saw is used on bench drill or drill machine. Hand drill or electric drill is not recommended. Specification: Product Name: Carbide Hole Cutter Material: Carbide, Carbon Steel Cutting Diameter: 20mm / 0.79 inch Cutting Depth: 25mm / 1 inch Shank Size: 10mm x 20mm / 0.4 inch x 0.8 inch (D*L) Overall Length: 109mm / 4.29 inch Side Hole Diameter: 8mm / 0.03 inch Drill Bit Diameter: 6mm / 0.24 inch Drill Bit Flute Length: 31mm / 1.22 inch Hex Wrench Size: 3mm / 0.12 inch Package Content: 1 x Carbide Hole Cutter,1 x Drill Bit, 1 x Hex Wrench Weight: 99g;Main Color: Gray