1、Basic Specifications: The milling cutter is equipped with bearings of various sizes to meet the needs of different sizes. The drill diameter is 1-3/8in, and the tool height is 1/2in. Different bearings will allow to make the following depths, 1/8in, 1/4in, 5/16in, 3/8in, 7/16in and 1/2im. 2、High Speed Steel: Industrial quality router bit, with a robust high speed steel body with rebound resistance design made of hardened materials, very durable and not easy to wear. The heat resistant coating prevents the accumulation of sawdust, resin and asphalt. 3、Application: The milling cutter is used for grooving the keyhole, which can process solids wood, hardwood, particle board, MDF, carbide materials. The blade of the miter tool will cut these materials accurately and easily. 4、Interchangeable Bearings: This milling cutter can cut grooves of different depths with interchangeable bearings to produce smooth cuts on both surfaces, and is usually used in handheld and desktop portable routers. 5、Reduce Woodworking Work: This drill bit tool will minimize your woodworking work, improve woodworking performance and easily create beautiful shapes.