The aluminum-titanium-nitride (AlTiN) coating on these bits resists heat and wear when cutting steel and stainless steel. They have a square cut style for creating slots, pockets, and edges. With spiral flutes, they leave a smooth finish and are good for making plunge cuts. The flutes lift chips up from the workpiece for applications that require a smooth finish on the bottom edge of the cut. Securely clamp your material before routing to prevent lifting. These bits are solid carbide for the longest tool life and fastest cutting speeds. The extreme hardness of carbide bits means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the bit from breaking.