[MATERIAL]: It is made of carbon steel and the surface is galvanized [SET INCLUDE]: Packing quantity:150 PCS (M3 40PCS;M4 40PCS;M5 30PCS;M6 20PCS;M8 15PCS;M10 5PCS) [EXQUISITE PACKAGING]: It is equipped with translucent storage box. There are several slots in the storage box to separate the products of different specifications for easy selection and use [STRONG AND DURABLE]: The surface of the product is galvanized, which can prevent corrosion and moisture, and has long service life [APPLICATION]: It is widely used on a variety of different materials, and can be installed in steel, plastic, glass fiber, etc.