The precision carbide reversible blades have a very long service lifeThey can be replaced quickly and easily thanks to the supplied key and screws.Spare reversible blades for reversible blade cutter. Always a sharp router due to the reversible blade system. Simple replacement due to supplied T15 TX key. Blade replacement allows the diameter of the router to remain the same. With two-sided blade4 spare reversible blades for cutter toolsmain platefor 492716, 492717, 491120 cutters