Designed for the Legacy Ornamental Milling machine, this bit allows you to follow a template when milling a contoured profile. It works on turnings up to 10" in diameter, square turnings up to 5" square or flat stock up to 5" thick. The router follows the template as you make approximately 1/4" deep cuts for 2 to 3 passes and then the bearing will follow the previous cut and support the router bit to eliminate chatter. It can also be used in a traditional router table like a pattern cutting router bit. 4-1/2" shank length is measured from middle of the knife to the end of the shank. 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. Always refer to the operation manual of your router first, in the event that a router bit doesn't come with a speed chart, you may start at about 2,000 rpm slower than the maximum speed described in the chart below. Maximum speed below is for reference only, actual best performance speed varies depending on a number of factors i.e. size of the router bit, the material to be cut, etc. Run 24,000 rpm maximum for 1" overall diameter router bits;