All reversible stile and rail bits come with a complete arbor assembly ( either 1/2" or 1/4" shank) , a profile cutter and one 1/4" x 3/8" deep slot cutters. These bits can be used to make both stile and rail cuts. In order to make glass doors of up to 1-1/8" stock, just stack one additional straight cutter next to the other. This carbide tipped bit is specifically designed and manufactured for the high quality demanded by woodworking industrial applications. The cutting edges of this router bit are made from high industrial grade micrograin carbide tips brazed onto a heat-treated high-carbon steel body thus leading to exceptional hardness and rigidity. Its cutting edges are radially relieved for a strong smooth cut in addition to avoiding rubbing and burning. It is precision ground, hardened, and tempered in order to stand up to a variety of materials. It is also equipped with wide open gullets for easy disposal of wood chips. It is suited for softwoods, hardwoods, chipboard, plywood and etc. Note : In order to avoid vibration and for maximum cutting quality, always choose a router bit with the shortest cutting edge and the shortest overall length available that is able to fit your project application. Excessive overall length may cause tool damage. Stile Cut : Set up router bit for stile cut (Profile Cutter, Straight Cutter, Bearing, Nut) Rip door sides to desired with. (typically 2" to 4") Set up router bit for stile cut. (Make sure the nut is secure by tightening in router) Set height of bit and make test cuts for desire pattern. Make all the stile cuts at one time to insure they are all the same. Cut a 6" length and save as a set up example. Cut length for desired door width. For Rail Length, it equals Door Height + 3/4" - Stile Width * 2 Rail Cut : Set up router bit for rail cut (Straight Cutter, Bearing, Profile Cutter, Nut ) Adjust the height of the bit for the bearing spacing even with the slot on the rail cut. Make final adj