【Size & Package】Thread Size: (d x L) M5 x 40mm; Package including: 10 x countersunk bolts screws. 【Premium Material】These countersunk bolts and screws are made from high-quality 304 Stainless Steel. They feature firm, clear threads and exquisite workmanship, offering excellent corrosion resistance and rustproof qualities. They are not prone to breaking or bending, providing high strength and performance for stability and durability in various environments. 【Threading Standardization】The threads of these hexagon socket bolts are uniform and smooth, with clear lines for balanced use and a good tightening effect. They are designed for easy fastening and disassembly, reducing the risk of slipping. 【Practical Design】The hex socket countersunk head screws expand the contact area to reduce pressure, protecting the screws and parts while ensuring balanced force. They resist deformation and slipping during use, offering a better fastening effect. The flat head design allows the screw head to sink into the installation surface, keeping it flat. 【Wide Application】These screws are suitable for all kinds of precision machinery, instruments, electronic products, household appliances, communication products, locks, lamps, toys, marine equipment, transportation equipment, and construction machinery. They are ideal for small repair workshops such as those in houses, shops, and garages. It is widely used in industrial.