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 use. The package includes 10 pieces of 40mm hooks, 10 pieces of 50mm hooks, and 10 pieces of 65mm hooks, for a total of 30 hooks. Product images include a data sheet showing all necessary dimensions of the cup hook, such as total length, thickness, inner diameter, outer diameter, and thread length. This helps users make easy and accurate selection decisions, avoiding size compatibility issues in their projects. With three different sizes ranging from small to large, these 30 hooks can meet a wide variety of hanging needs. The eyelet screws are suitable for use in gardens and kitchens. The threaded end is designed to be screwed into wood materials such as fences, wooden beams, and cabinet boards, while the hook end can support items like lights, ropes, chains, and feeders.