Abstract: A device for cutting openings having a predetermined shape in a drywall panel includes a housing with a base and an integrally formed side wall extending outwardly from the periphery of the base in a substantially perpendicular fashion. The base and the side wall defining a cavity therebetween. A strike plate is slidably received inside the cavity, and has a shape corresponding to that of the predetermined shape of the opening. The strike plate is movable within the cavity between a normally retracted position, wherein the strike plate is maintained in abutment with the base, and an extended position. A plurality of cutting blades are removably secured to the periphery of the strike plate inside the cavity. Cutting surfaces of the blades cut through the panel to form the opening when the strike plate is moved to its extended position. A strike plug extends from outside the cavity through the base and strike plate into the cavity.