Specification: Item Type: Carbide Hole Saw Material: Carbide Purpose: To make holes in steel plate, iron plate, stainless steel, aluminum plate, calcium silicate plate, plastic plate, resin plate, FRP plate Plate Cutting Thickness: Approx. 3mm / 0.1in Total Length: Approx. 88mm / 3.5in Inner Wall Thickness: Approx. 20mm / 0.8in Shank Diameter: Approx. 9.8mm / 0.4in Hole Diameter Specification: Approx. 50mm / 2in 51mm / 2.01in 53mm / 2.1in 55mm / 2.2in 60mm / 2.4in 65mm / 2.6in 70mm / 2.8in 75mm / 3in 80mm / 3.1in 85mm / 3.3in 90mm / 3.5in 95mm / 3.7in 100mm / 3.9in Package List: 1 x Hole Saw 1 x Spring 1 x Hex Wrench Note: Not suitable for electric drills and impact drills, as well as materials such as tiles, concrete, wall, and stones.