Material: Alloy Outer Diameter Size: 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 53mm Chuck Size: 10mm Application: Can be used for bench drills and electric drill chucks with machine tools Product Description： [High Quality Material] The gears are made of YG8 tungsten carbide steel, and the rigidity varies from the hole saw has a twist drill inside, sharp edge, high strength, high precision, smooth cutting, especially impact resistance and resistance mill. [Intelligent Design] 64HRC to 65HRC. Three groups of edges, each blade in the cutting process is responsible for 1/3 of. Sharp gears and low-consumption anti-cutting edges make the product have a long service life. [13 different sizes] Outer diameter size: 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 35mm, 40mm, 45mm, 50mm, 53mm [Decorative hole drilling] Carbide teeth for fast cutting of clean round holes. Suitable for handheld electric drills, motorized drills and mobile ribbon-type magnetic drills.