Features 1、The main body is made of cemented carbide with high hardness, which can effectively extend the service life. 2、The cutting edge is sharp, the opening is neat, smooth without broken edges, and the cutting resistance is small. 3、The front and rear inclined tooth‑shaped design has low resistance and strong perforation ability. 4、It is suitable for a variety of materials and works more efficiently. It can be used for steel plate, iron plate, stainless steel, aluminum plate, calcium silicate plate, plastic plate, resin plate, and FRP plate to open holes. 5、Comes with spring and hex wrench in this package, which can provide much convenience for your using. Specification Item Type: Hole Saw Cutter Material: Cemented Carbide Purpose: Can be used to open holes for steel plate, iron plate, stainless steel, aluminum plate, calcium silicate plate, plastic plate, resin plate and 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 Package List 1 x Hole Saw Cutter 1 x Spring 1 x Hex Wrench