Imagine two router bits that create any door in 5/8 inch to 1-1/4 inch door thickness range, create "rattle free" flat panel doors, create ANY length long tenon construction and more. That"s what Freud"s new Premier Rail & Stile router bit systems do * Adjustable shims enable both a tight fit when using plywood panels and the ability to use thick panels ( from 5.5mm to 6.35mm ). The unique cutter geometry virtually eliminates tearout * Top portion of cutter, including bearing and spindle, is removed to produce the front of the long tenon profile for blind tenons, through tenons, or bridle joints * Bits feature Freud"s Perma-Shield coating that reduces heat and pitch build up along with rust, and Freud"s TiCo Hi-Density Carbide to maximize bit life and material finish * Optional cutters are available for double profile doors (99-862) with variable thicknesses and long tenons for perfecting matching profiles on all doors because it"s the same set of router bits