Designed to quickly convert a variety of drill presses into accurate mortising machines, the DELTA 17-935 mortising attachment is compatible with the DELTA 11-980, DP300, 14-040, 14-070 and DP100 drill presses and 11-090 radial drill press. This attachment also fits drill presses with quill diameters of 66-, 50.8-, 48-, and 38-millimeter--including Sears model 21313, 21315, and 21317 drill presses. Consisting of a fence bolted to the drill press table and two hooked rods to hold work against fence, this attachment offers a 4-inch capacity under hold downs (3/4-inch from ends of hook rods to the fence). This system is compatible with DELTA chisels for mortising, needs no tools to attach or remove, and comes with a hand lever adjustment for easy setup.