Make snap-together grills for a divided light look. The straight bit cuts halfway through the material.  Angular bit cuts away material on each side leaving the width of the straight cutter to create the perfect-fitting lapped joint.  The large bit is 1-1/4″ Dia, 11/16″ total cut length. The straight bit is 1/4″ Dia, 13/16″ total cut length.  Both are 1/2″ shanks.  Carbide tipped. Learn how to use HERE.