Material: The blade is made of high-quality hard alloy, which has the characteristics of clean cutting, stable rotation and easy operation. Durable: the whole body of the knife is heat treated, with good concentricity, strong anti-rotation lock, and high performance, high wear resistance and durability. Design: The finished piece is smooth inside and out with no burrs or burrs and is shaped once for production efficiency. 4 Different Sizes: Kit contains 4 sizes of different slots, 3/4/5 / 6 mm. Variety of options for your needs. Versatile: Straight planer head for grooving and milling wood. Suitable for cutting all composite materials, plywood and cork. Number of pieces supplied: 4 Size: please see the details Note: the data is manual measurement, please allow 1-7cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.