The screw eyes are made of 304 stainless steel. These screw hooks are stronger and more durable than those made of iron with a coated nickel/zinc/vinyl surface, and especially more reliable for outdoor hanging. The screw eyes come in the following sizes: 10 pcs 40mm long hooks, 10 pcs 50mm long hooks, and 10 pcs 65mm long hooks, totaling 30 pcs. Among the product images, there is a data sheet that specifies all necessary dimensions for the cup hook, including total length, thickness, inner diameter, outer diameter, and thread length. This contributes to an easy choice for users and eliminates size matching problems in their projects. 30 pcs screw hooks with 3 sizes from small to large, this can cover most occasions when a hanging screw hook is required in a project. The eye bolts can be used in gardens and kitchens. The threaded end is for screwing into wood materials, such as fences, wooden beams, and cabinet panels, while the hook end is for hanging items such as lamps, ropes, chains, feeders, and so on.