Profile: National Machine Tool Co. designs and manufactures precision internal keyseating & oilgrooving miller equipment. Our miller is used in drill presses, radial drills, machining centers, vertical mills and CNC equipment. Our straight diameter spindle shank is fitted with a morse taper shank or various tool holding systems. Our keyseating miller mills a finished slot in one pass in either open end or blind bores & stock tool is furnished with a cutter, a guide key of corresponding width and a fitted thrust collar. We design closed-end oilgrooving miller, which mills oilgrooves, starting inside bore 1/8" to 3/16" from the beginning of the hole and the tool can be used in open-end or blind bores.