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Title: Only for Solid Doors
Review: After we finally figured out the instructions for installation (the pictures were so tiny), we installed one correctly. Then, when we tried to install the second one, we found out that our doors aren't solid. The small magnet part fell all the way to the bottom. After 30 minutes of trying to extract the magnet from the door, we finally installed that, but the parts just didn't fit well together. This was more trouble than it was worth, and we purchased the old-fashioned ones. It was also much more expensive than the old-fashioned ones. Oh well, we probably would have lost the magnetic key in a few months anyway.
