Q-shaped safety buckle design: an elastic metal buckle is attached to the ordinary screw hook, you don't have to worry about items falling off the hook in the wind, and ensures safety when hanging slightly heavier items such as plants. High-quality metal: made of high-quality stainless steel and coated with rust-proof coating. 4mm diameter, not easy to break. Tested for weights of up to 10-18 kg. The total hook is 53mm and the thread itself is 25mm; screw end is 6mm in diameter. Easy to install: it is easy to mount on wood, perfect for fence, patio, tree trunk, porch, ceiling and more. Hammer the tip of the screw hook into the wood with a hammer and then tighten it with pliers or wrench. If the wood is hard, drill holes in the wall beforehand and then screw a dowel and the hook into the wall together. Wide use: perfect for firmly hung lightweight items such as outdoor wires, decorative Christmas lanterns, fairy lights, wind chimes, bird cages, ropes, flower pots, cups, lamps, flower troughs and more. What you get: 20 pieces screw hooks and 20 pieces plastic tube included