This standard applies to portable power tools for drilling, grinding, polishing, sawing, and driving threaded fasteners & hand tools for driving threaded fasteners. Other tools not classed as percussion tools belong in this category and may be added by revision of addition through the usual procedure. This standard includes dimension and tolerances for both driving and driven elements where such coordination is important and not established by reference to the pertinent American National Standards. All dimensions are in inches and millimeters.