This CMT three-piece router bit set simplifies door construction, making it easy as 1, 2, 3! It is not the only advantage, in fact this is a multifunctional set for door and furniture makers building entry or passage doors and any furniture tenons. The included tenon cutter produces a beefy 27mm (1-1/16”) long tenon. Coupled with the cope cutter, you can produce long and strong tenons with minimum setup. As an extra bonus the tenon cutter can be used for furniture making requiring any tenon from 4,7mm (3/16”) to 16mm (5/8”) thick.