Mortising attachment comes with four popular mortising chisel and bit sets * 1/4-inch, 5/16-inch, 3/8-inch, and 1/2-inch set * Also includes a handy carrying case that holds everything for easy storage * Offers large 4-inch capacity under hold-downs, 2-3/4-inches from ends of hook rods to fence * Also fits drill presses with quill diameters of 66-milimeters, 50.8-milimeters, 48-milimeters, and 38-milimeters