Durable Metal: Those screw-in hooks are made of carbon steel, plated brass, durable, strong and has a long service life.Surface treated with electroplating,can prevent rust and more durable holding capacity good appearance and decorative properties. .Easy to install: The sharp point screw design can be directly screwed into wood or wall or ceiling., and can be installed without pre-punching. Ideal for indoor and outdoor projects. .How to use: Each of hooks has a self-tapping tapered end which assists with installing the hooks into wooden materials. Simply push the sharp end of the screw thread into the wood using your hand and then you can manually twist the hook clockwise to begin winding the thread into the surface of the wood. .Size: Each screw-in screw hook is 2 inches, set of 50, to meet your daily need. The metal hooks with special S shape make them easy to be used as the cup hooks, wall hooks, ceiling hook. These hooks have multiple uses. .