Craftsman Shelf Hook

I have Craftsman heavy duty plastic shelves used for storage, and wanted to put a hook to hold bags in the slots used mostly for connecting two shelves together. The hook is a little loose due to the design of the slot that it fits in. When I made the hook a bit larger, it needed a rubber mallet to put in and almost impossible to remove. This one is tight enough to be snug, but loose enough to be removable from the shelves.