Premium MaterialOur bolt dome caps are made of exceptional plastic material with smooth edges and high strength, not easy to break or deform, wear-resistant and durable. Easy to UseThese assorted bolt covers are easy to install and remove, easy to use, waterproof and dustproof, good for protecting screws from rust, water, dust, etc. Easy to store All plastic hex nut covers are equipped with a high-quality transparent plastic box for easy storage and transportation, clear classification, and can prevent nut covers from missing. Wide applications The black protective cap provides effective protection and at the same time improves the appearance of the product. The screw caps can be used as high-strength fasteners for machinery, furniture, vehicles, etc. What you will get You will receive 50 pcs m4, 30 pcs m5, 20 pcs m6 , 10pcs m8, 20pcs m10, 15pcs m12, a total of 145pcs, more models, more sizes can meet your different needs, enough for your daily use.