Features 1、The main body is made of cemented carbide, which effectively extends the service life. 2、Compatible with a variety of materials, work more efficiently, can be used for steel plate, stainless steel, resin plate, FRP plate hole opener. 3、The cutting edge is sharping, the opening is neat and smoothly without broken edges, and the cutting resistance is small. 4、Front and back angle tooth design, low resistance and strong perforation ability. 5、Not suitable for hand drills and impact drills, as well as ceramic tiles, concrete, wall, stone and other materials. Specification Item Type: Carbide Hole Saw Drill Bit Material: Carbide Purpose: Steel plate iron plate, stainless steel, aluminum plate, calcium silicate plate, plastic plate, resin plate, FRP plate opening, etc. Plate Cutting Thickness: Approx. 3mm / 0.1in Total Length: Approx. 88mm / 3.5in Inner Wall Thickness: Approx. 20mm / 0.8in Shank Diameter: φApprox. 9.8mm / 0.4in Hole Diameter Specification: φApprox. 40mm / 1.6in 42mm / 1.7in 45mm / 1.8in 48mm / 1.9in Package List 1 x Hole Saw Drill Bit 1 x Spring 1 x Hex Wrench