A milling cutter is a tool used for cutting, shaping and machining various materials such as wood, metal, plastic or stone. It usually consists of a cylindrical shank and a cutting element called a cutting head or cutting insert.

There are different types of cutters depending on the application. For example, there are slot cutters, which are used to cut grooves or channels in materials. End mills are often used for general milling work and have a straight shank that is clamped into a milling machine. Face milling cutters have the cutting head on the face of the cutter and are used to mill surfaces or finish edges.

Milling cutters are typically used with a milling machine that allows the tool to rotate and machine the material. When using a router, it is important to set the proper cutting speed, feed rate, and correct positioning of the router to achieve an efficient and accurate result.

Choosing the right router depends on several factors, including the type of material to be machined, the desired depth of cut, and the desired surface finish. It is important to follow the manufacturer's instructions and safety recommendations when handling cutters to avoid injury.