BFreud 99-762 New Premier Adjustable Rail and Stile System Shaker Profile Long Tenon Shank Router Bit ,12-Inch ReviewbP PP Freud 99-762 New Premier Adjustable Rail and Stile System Shaker Profile Long Tenon Shank Router Bit ,12-Inch PImagine two router bits that create any door in 58 inch to 1-14 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 doPAdjustable shims enable both a tight fit when using plywood panels and the ability to use thick panels ( from 5.5mm to 6.35mm ).