It"s tough to beat the "old faithful" mortise and tenon joint for strength and accuracy, even with all the other joining options in the world of woodworking. It isn"t the easiest joint to make, but it sure helps to have the best quality tools in your shop. That"s why we"ve added a new selection of Chisel and Bit sets in all the popular sizes, from 1/4" to 34" diameter. These sets are for use in any standard drill press mortising attachment of mortising machine. (Verified to fit Powermatic, Shop Fox and Jet mortisers. Delta requires a bushing)