The screw-in hooks are made of 304 stainless steel. These screw hooks are stronger and more durable than iron hooks with nickel, zinc, or vinyl coatings, and are especially reliable for outdoor hanging. The package includes: 10 pieces of 40mm length hooks, 10 pieces of 50mm length hooks, and 10 pieces of 65mm length hooks, for a total of 30 pieces. Product images include a data sheet that specifies all necessary dimensions of the cup hook, including total length, thickness, internal diameter, outer diameter, and thread length. This helps users make easy and accurate selection decisions, avoiding size compatibility issues in their projects. With 30 hook screws in three sizes ranging from small to large, this set covers most applications where a hanging screw hook is needed. The eyelet screws can be used in gardens and kitchens. The threaded end is designed to be screwed into wooden materials such as fences, wooden beams, and cupboard boards, while the hook end is suitable for hanging items like lights, ropes, chains, and feeders.