2-wing design is most popular and economically priced. 3-wing and 4-wing design is sturdy and is commonly used for slotting plywood and composition boards to make T-moldings, box joints, spline joints and biscuit jointing. All slotting cutters can be interchangeable and stacked on the same 5/16" spindle arbor for various applications. Must be used with arbors with 5/16" spindle, such as Magnate Tool No. 4301, 4302, and 4303. By replacing the original bearing, Magnate BR-06, the cut depth varies as following:Â Â OriginalBearing Cutting Depth Matrix BR-20 BR-21 BR-22 BR-23 BR-25 1/2" 7/16" 3/8" 5/16" 1/4" 3/16" 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. Additional Details ------------------------------ Package quantity: 1