Description: These screws are made of high quality carbon steel, they are very strong and durable to use. Zinc plated countersunk bolts is anti-corrosion,rustless,non-pollution and high-hardness. It is widely used in industrial. Features: 1. Made of high quality carbon steel, very strong and durable to use, environment-friendly, no pollution, high hardness. 2. This set is organized by size in a transparent storage case for quick access and protection. 3. There are 8 different lengths in one set to meet your various needs. 4. The moderate and clear cross heads can make your working more easily. 5. Ideal for use by a variety of workers and repairmen from plumbers to assemblymen both professional and amateur, even DIYers can opt to use it. Specifications: Material: Carbon Steel Color: Black Weight: Approx. 139g M2 x 4 M2 x 6 M2 x 8 M2 x 12 100pcs 100pcs 100pcs 100pcs M2 x 5 M2 x 7 M2 x 10 M2 x 16 100pcs 100pcs 100pcs 100pcs Package Include: 1 Set x Cross Screws (include 800pcs)