According to the present invention, an apparatus is provided that allows cutting an opening in a material, such as a wall or surface, while accurately controlling the depth of penetration so as not to damage or destroy any existing materials behind the wall or surface, and also without needing equal access behind the wall or surface. In a preferred embodiment of the invention, the apparatus includes a support block assembly having a thickness and at least one primary surface, the at least one primary surface defining a perimeter of the support block assembly; and one or more cutting blades coupled to the support block assembly in at least one location and extending away from the at least one primary surface, the one or more cutting blades being arranged in a closed plane orientation and each being coupled to the support block assembly such that the one or more cutting blades extend away from the at least one primary surface at an inset distance relative to the perimeter of the support block assembly. In another preferred embodiment, the apparatus includes one or more levels. And in another preferred embodiment, the apparatus includes a handle.
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