DRILL STRAIGHT It projects a series of circular patterns on the work surface that indicate alignment or misalignment of the drill bit with regards to the work surface. When the patterns are concentric, the drill is straight with (and perpendicular to) the work surface. ANY ORIENTATION It works in any orientation, so it can easily be used on walls, floors, ceilings, or boards at any angle. The unit's unique shape also allows it to be virtually invisible during drill rotation, so the drill bit, work surface, and the projected patterns are clear and easy to see. SAFE TO USE It safely disconnects if an obstacle is encountered during drilling operations. WORKS WITH YOUR DRILL It was designed to work with thousands of common standard electric drills and drill chucks. NON CONTACT Unlike traditional drill guides, drill cups, or drill blocks, it does not need to contact the work surface you drill into, and thus will not scratch or mar it during normal operation. Further, unlike traditional drill guides, drill cups, or drill blocks, it does not block or obstruct your view of the drill bit or work surface during a drilling operation.