Features 1、[Durable High Speed Steel] Made of high quality high speed steel material, sturdy and durable, long service life. 2、[Three Blades Design] Inner, middle and outer three blades design, higher efficiency, not easy to collapse. 3、[Inclination Angle Design] Inclination angle design reduces friction and reduces the temperature of the knife. 4、[Evacuate Chips Smoothly] Evacuate chips smoothly, greatly reducing jamming and tool breakage, and stable performance. 5、[Applicability] Suitable for metal openings such as cast iron, steel plate, thick stainless steel, thick non standard iron, etc. Specification Item Type: Hole Saw Material: High Speed Steel Handle Diameter: Approx. 10mm / 0.4in Total Length: Approx. 90mm / 3.5in Working Depth: Approx. 25mm / 1.0in Uses: Metal Openings for Cast Iron, Steel Plate, Thick Stainless Steel, Thick Non Standard Iron, Etc. Package List 1 x Hole Saw 1 x Hex Key 1 x Storage Box