A router lift is a specialized device that is used to raise and lower a router bit. It is designed to fit onto a router table and typically consists of a handle, a base plate, and a lifting mechanism. Router lifts are used when it is necessary to change the height of the bit, such as when routing different thicknesses of material or when making adjustments for different types of cuts. They can also be used to make fine adjustments in the depth of the cut. In addition, router lifts can be used to change the angle of the bit, which helps create chamfers or bevels.