Freud's unique Premier Adjustable Rail and Stile System builds perfect doors in material from 5/8" to 1-1/4" thick, and also features Freud's patented technology for producing extra-strong long tenon joints. The System also includes adjustable shims to adjust the panel groove from 7/32"(5.5mm) for thinner plywood panels to 3/8" (9.5mm) thick for larger solid wood raised panels. Offered in five different profiles to suit any project! For even more versatility, add optional cutters to produce double-sided doors, or the optional cutter for glass and screen door construction. Use in table-mounted routers to mill and hardwood or softwood.