Create rock-solid interlocking corner joints with Freud Lock Miter Bits. For 90 degree joints use the 99-034 or 99-035 bits. These bits are designed to rout one piece horizontally on the router table, and the other piece standing vertical. For precise 45 degree joints us the 99-043 set, with one bit routing the tongue and the other bit routing the groove. For routing solid hardwood or softwood on table mounted routers or CNC machines only.