They are very sharp so you don't have to press really hard into the ceiling while you are screwing them in, The tips of the threads made them easier to start into wood. But once they are in, they hold tight.
Made of zinc plated carbon steel, zinc plated protect them from getting rust and make it glossy without burr, rust resistant and high corrosion resistance.
Widely used in wood hand work, good for home, workplace, office, indoor and outdoor applications, can be used as a ceiling hook to hang plants or bulbs, cups, keys and other gadgets, a perfect daily assistant accessories.