This set allows the woodworker to build doors from 5/8 inch to 1-1/4 inch thickness and any length long tenon construction for rock-solid joints that last a lifetime * This set features Freud"s 99-569 2 + 2 raised panel bit w/backcutter. Two small wings that cut downward and two large wings that shear upward, produce an extremely smooth cut in hardwoods, softwoods and even plywoods * Bit feature Freud"s Perma-Shield coating that reduces heat and pitch build up along with rust * Bit features Freud"s TiCo Hi-Density Carbide to maximize bit life and material finish * Optional cutters are available for double sided profile doors (99-861) and glass panel doors (54-760)