A. Premium Material Our bolt dome caps are made of a good plastic material with smooth edges and relatively high strength. They are not prone to breakage or deformation, and are wear-resistant and long-lasting. B. Easy to Use These assorted bolt covers are relatively easy to install and remove, and are user-friendly. They are waterproof and dustproof, which helps protect screws from rust, water, dust, etc. C. Easy to store All plastic hex nut covers come with a transparent plastic box for convenient storage and transportation. They are clearly classified and can prevent the nut covers from getting lost. D. Wide applications The black protective cap provides effective protection and at the same time enhances the appearance of the product. The screw caps can be used as fasteners for machinery, furniture, vehicles, etc. E. What you will get You will receive 50 pcs m4, 30 pcs m5, 20 pcs m6, 10 pcs m8, 20 pcs m10, 15 pcs m12, a total of 145 pcs. More models and sizes can meet different needs and are sufficient for daily use.