Q-Shaped Buckle Design - Not like the ordinary ceiling hooks, the safety latch is added to prevent hanging objects from falling or sliding out even with Vertical installation. No more worry about string lights being fall off. Premium Material - Screw hooks are made of high quality strong steel with rust proof coating, sun-proof and waterproof.It can hold up to 40 lbs objects and it's suitable for indoors and outdoors hanging. Easy To Install - Come with plastic tubes, cup hooks are easy to install all solid surface such as walls, ceiling, wooden beams, tree, fence, eaves etc. You can hammer the hooks directly or wrench in. Best Value Deal - Outdoor hooks works for hanging string lights, plants, flower pots, Christmas decorative lanterns, fairy lights, festival decoration lights, curtains, bird feeders and cages, ropes, chains, and more.