So it works fine with my cheap brooms but a mop with a big pole won't work. The maximum diameter is 1 inch I would say. Too bad half of my cleaning tools don't fit. One mop had a loop so I tried the hook but the hook is so crooked that it can't hold it, short hooks with a high angle. Definitely NOT for external tools. So disappointed. It seems strong enough to hold those heavy items, but the design doesn't allow for it. It will hold up well. I wish it had a bigger handle for my other house cleaning tools.