【Multiple Sizes】Includes black and white nut covers in 6 sizes, M4*7, M5*8, M6*10, M8*13, M10*17, M12*18 (black/white), 300 pieces in total, can meet your different needs. 【Beautiful and Practical】Hexagon nut covers are good for protecting screws from rust, water, dust, etc., which extends the service life, covers the screw heads and improves the appearance. 【Easy to Use】You just need to put the screws of the right size into the screw head cover hole and press hard, which one person can easily do. 【Nylon Material】Screw nut covers are made of nylon high quality, smooth surface without burr, scratch-resistant, durable and not easy to deform. 【With Storage Box】Different sizes and colors of Hexagonal Screw Protectors are placed separately in the plastic box to avoid confusion, easy to carry and use.