This power strip is applied on a large scale with a hole cutter (79mm) included. Only stupid if this meaningful tool completely missing. Especially since such a hole cutter in the package would have no place. Nice would have been a fitting instruction (simple drawing would be enough). Add to that the poorly constructed Parental Control. In order to get a plug in the can would have to push so strong that the strip breaks. Therefore, one must definitely at the back to hold. Comfortable is not. When installing has found that one needs a hole saw with 79mm diameter out. Since no hole saw (hole cutter) came with measured it for safety's sake itself. The first measurement with calipers gave me only 76mm. Bought hole saw and found there are still tabs and notches that do not fit so. Therefore, the Dremel had to be added are drawn. All in all, looks nice idea is good, the bad implementation and monitoring of the delivery seems to be missing.