Features Made of high quality carbon steel, very strong and durable to use, environment-friendly, no pollution, high hardness. This set is organized by size in a transparent storage case for quick access and protection. There are 8 different lengths in one set to meet your various needs. The moderate and clear cross heads can make your working more easily. 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. 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. Specifications: Material: Carbon Steel Color: Black Weight: Approx. 139g M2 x 4M2 x 6M2 x 8M2 x 12100pcs100pcs100pcs100pcsM2 x 5M2 x 7M2 x 10M2 x 16100pcs100pcs100pcs100pcs Package Include: 1 Set x Cross Screws (include 800pcs) Package List