20 PCS Screw Hooks with Safety Buckle, Heavy Duty Ceiling Hooks for Hanging Outd
These string light hooks are very easy to intall. You can screw the hooks into the wooden wall directly by hand or wrench. If you want to install it on a concrete wall, you should drill a 0.24″(6mm) hole first, then plug the expansion tube into the hole, and then use a wrench to screw in the hook.