High-quality Material: It is made of sturdy material with a black coating on the surface, which is not easy to break and rust. It can bear up to 50 pounds, perfect for indoor and outdoor use.Easy to install: You can screw the hook into the wood with a wrench, or use an electric drill to drill a hole in the concrete wall, clean the hole and plug the expansion tube into, finally use a Wing Nut Drill Bit Socket Tool to screw the hook in. 0.2 drill bit is recommended. Wing nut driver is a perfect tool that works with any power drill. The overall hook is 2.2inch, thread is 0.75inch, loop is 0.75inch, and the opening is 0.5inch.Safety Buckle Design: Based on ordinary hooks,a safety buckle design to prevent hanging objects from falling. The 0.25inch hexagonal shank wing nut sleeve is suitable for any electric drill.Hooks for String Lights: It is very suitable for safe hanging and finishing items, Christmas decoration lights, outdoor wires, flower pots, bird feeders, mugs, pictures, utensils, wreaths, tools, etc.colour:BlackMaterial:Metalsize:56mmPackage Contents:18 x Lights Hanger Hooks18 x Expansion Tube1 x Wing Nut Driver