Solid Carbide Spiral with Ball Bearing Downcut, 2 flutes 1/2″ Dia x 1 1/4″ Cut 1/2″ Shank Spiral bits have a cutting edge that is constantly in contact with the material. The load on the work piece and the bit is constant, uniform and draws less power than the conventional straight bit. As a result more stock can be removed and faster feed rates can be applied. The cut is a peeling action rather than a chipping action. Spiral bits perform best at higher feed rates in a straight line and require more hold-down pressure. For the ultimate, chip-free finish in laminate, melamine, solid surface and fragile veneers, and for template work of all kinds. The twin ball-bearing pilot enhances the stability of the tool. Downcut for better clamping when machining small work pieces and improved finish on the top of the board. For use on routers with or without CNC control.