Premium Quality: Made from high quality TCT carbide (tungsten carbide tipped burrs), high quality titanium plated cemented carbide teeth, ensuring its high hardness, anti-rust, sturdy and durable < p>Dimensions: cutting diameter: 22mm, depth of cut: 25mm, shank diameter:: 10mm, perfect for drilling hard metals Unique three-blade design: this TCT hole saw is designed with three blades, includes an outer blade, a middle blade and an inner blade, which makes it sharper and more efficient, ideal for cutting hard metals Versatile tools: This set of tungsten carbide hole saws applies to bench drill, magnetic drill, gun drill, percussion and so on. Perfect for hard metals, stainless steel plates, square tubing, iron, cast iron, wood, FRP and other common sheet metals. Note: Cannot be used for concrete, tile and stone. High precision and easy to use: TCT carbide steel teeth for fast cutting of clean round holes. Suitable for hand electric drill, stand motorized drilling machine and moving tape type magnetic drilling machine; Contents: 1 TCT hole saw and 2 titanium plated pilot drill bits. Each cookie cutter is individually packed in a plastic box and each bit is also oiled (to prevent rusting). Product Specification: Material: TCT Carbide; Cutting Depth: 25mm; Shank Diameter: 10mm Package Included: 1*TCT Hole Saw 1*Titanium Plated Pilot Drill Bit Warm Tips: This hole saw cannot be used for concrete, tile and stone. Do not forget to use a lubricant so that the bit does not overheat. It can be water or some kind of oil.