Abstract: A wallboard cutter according to the teachings of the present invention is shown as including an open housing comprising an inverted channel with rollers extending partially into the channel at either end to facilitate the movement as the channel is drawn along the edge of the wallboard. A measure rod with digital marks is extended slideably up through the housing parallel with the channel walls with tightening means to the housing. A handle with a cutting blade is rotatably attached to the measure rod at the zero end to cut, or score, the wallboard as the unit is pulled over the wallboard by the unit handle which extends up from the housing in spaced relation to and parallel with the measure rod.

Abstract: A rectangular hole cutter according to the teachings of the present embodiment of present invention is wholly shown as including a two-member cam device within a housing with a base plate, for vibrating one of three sets of alternate cutting blades to saw a rectangular hole in wall material. The cam is powered by an electric hand drill into which a stem from the male cam member has been inserted. The male cam swivels in a notch part of the female cam, which is centered on a base plate below the housing base plate, causing a vertical vibration in the unit as it is hand held against the area to be cut. The three blade sets, which are used for different materials, are generally of several blade members linked together rotatably and attached rotatably to a base plate which is secured to the bottom of the female cam member base plate.