This bolt cover set is made of quality PE material, not easy to break, durable, promising long term durability. Helps to protect the screws from outside rust, water, dust, etc., helps to extend the life of the screws, and also helps to decorate your furniture. 6 sizes of bolt cover/screw cap available, width varies from 7mm to 18mm: 50 pcs M47, 30 pcs M58, 20 pcs M610, 10 pcs M813, 20 pcs M10* 17, 15 pieces M12*19, which can fulfill your various unexpected needs. Comes with a plastic storage box, you can find the corresponding size easily, can prevent the nut cover and other small items from missing, easy storage and carrying. Features: This product is made of quality PE material, not easy to break, durable, promising long-lasting durability. Works well for covering metal hexagon heads of screws, bolts and nuts without scratching. Provides strong, all-around protection for you while enhancing the appearance of your fastener. Helps protect screws from rusting on the outside, water,