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 coating, 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. A data sheet is included in the product images, showing all necessary dimensions of the cup hook, including total length, thickness, inner diameter, outer diameter, and thread length. This helps users make an informed selection and avoids size compatibility issues in their projects. With three sizes ranging from small to large, these 30 hook screws can meet a wide range of hanging needs. 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 cabinet boards, while the hook end can hold items such as lights, ropes, chains, feeders, and more.