We rent an apartment so installing child safety locks that need to be screwed to doors isn't an option for us. I found these to use instead, but because they need to connect two knobs or handles together, they don't work on most of our cabinets including the bathroom cabinet that holds our cleaning supplies. I only use one of these safety locks on the cabinet under the kitchen sink because it's not one I need to go into very often, but it's one that is unsafe for children to get into. After fighting with it to open and close it, I finally set it so it keeps the cabinets closed, but I can, with a fair amount of effort, slide it off the cabinet handles. That is essentially the only way to use it without an insane amount of stress. Also, these would not work on knobs that are thicker so they're really very limited cabinet locks and I wouldn't recommend buying them unless you are able to try them out and be sure that they fit. If you decide to use them, I recommend practicing opening and closing the safety locks before trying them out on a cabinet because it may be a while before you get back in it otherwise!