1. Made of high quality carbon steel, very strong and durable to use, eco-friendly, pollution-free, high hardness2. This set is organized by size in a clear storage case for quick access and protection3. There are 8 different lengths in one set to meet your different needs4. Moderate and clear cross heads can make your job easier5. Ideal for use by a variety of workers and repairers, from plumbers to professional and amateur assemblers, even DIYers can choose to use it. Specification: Description:These screws are made of high quality carbon steel, they are very strong and durable to use. Zinc plated countersunk head bolts are anti-corrosion, anti-rust, non-polluting and high hardness. It is widely used in industry. Features: 1. Made of high quality carbon steel, very strong and durable to use, eco-friendly, pollution-free, high hardness.2. This set is organized by size in a clear storage case for quick access and protection.3. There are 8 different lengths in one set to meet your different needs.4. Moderate and light cross heads can make your work easier.5. Ideal for use by a variety of workers and repairers, from plumbers to professional and amateur assemblers, even DIYers can choose to use it. Features: Material: Carbon steelThe color blackWeight: approx. 139gM2 x 4M2 x 6M2 x 8M2 x 12100pcs100pcs100pcs100pcsM2 x 5M2 x 7M2 x 10M2 x 16100pcs100pcs100pcs100pcsPackage includes:1 set x Phillips screws (include 800 pieces) Note: The data is manual measurement, please allow 1-12cm error, in Due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.