Feature: 1. High accuracy and smooth cutting edge ensure smooth chip removal, also has great impact resistance and wear resistance. 2. The hole saw is made of high speed steel bi metal, and the 2mm thick incisive teeth have ultra high hardness (70‑82HRC). 3. Special gear design makes the hole more accurate and symmetrical, and the carbon steel teeth enable fast and clean cutting. 4. There are 11 different sizes of hole saws, which will satisfy your various work needs while ensuring high working efficiency. 5. The storage box with designated slot can put each item in the appropriate position, making the carrying much easier as well. Specification: Item Type: Hole Saw Material: High Speed Steel Function: Bi Metal Hole Saw Tool Handle Type: Hex Cooling Type: External Cooling Cutting Diameter: 19mm (3/4in), 22mm (7/8in), 25mm (1in), 29mm (1-1/8in), 35mm(1-3/8in), 38mm(1-1/2in), 44mm(1-3/4in), 51mm(2in), 54mm(2-1/8in), 57mm(2-1/4in), 64mm(2-1/2in). Outer Blade Tip Angle: 45°. . Package List: 11 x Bi Metal Hole Saw2 x Mandrel1 x Straight Rod1 x L Shape Wrench1 x Drill Nut1 x Washer1 x Black Storage Box Note: Use with electric drills, pay attention to electricity safety and use arrangements.