These ceiling hanging hooks are made of high quality metal,The thread of the ceiling hook is Paint, which is rust-proof. Screw heads are pointed and sharp in design and they can be easily installed wherever. The length of cup hook is 2.9 inch, and the length of the screw is 0.9 in, and the opener is 0.87 in, which is enough for you to hang common objects in your life. The heavy duty ceiling hooks enhance the bearing capacity and are not prone to deformation, and they are stronger and more durable than ordinary hooks. Easy Install: To install a hook on the wall, you need to make a hole in the wall, put a plastic tube, and then put the hook into the plastic tube. Suitable for all solid surface such as wood, wall, ceiling, outdoor eaves, etc. Wide Application: Perfect for securely hanging light weight items,such as Christmas decoration lights, outdoor wires, outdoor Lights, drip line, plants, birdhouses, curtains, ropes, chains, mugs, feeders, planters, garland decorations and more, Manufacturer: Tiardey