This attachment for Leigh Dovetail Jigs cuts one of the most challenging joints there is with ease and precision. The multiple mortise and tenon is traditionally considered the strongest as well as the most dramatically attractive way to join a shelf or a partition to a carcase; and the fully adjustable Leigh MMT attachment enables you to cut this classic joint in virtually any size or spacing arrangement you like. You can cut flush or raised tenons, and through or blind mortises--with round corners or square (with a little chiseling in the mortises)--in any stock up to 24" wide, from 5/16" to 1-1/2" thick. Joints can be cut using a 1/2" spiral end mill router bit (provided with the jig) with 5/8" od. template guide.