M8 Button Head Socket Cap Bolts Screws, Made of 304 stainless steel , high hardness, corrosion resistance, can be used in humid environments, and do not worry about rust. Metric M8 screws,Thread Diameter: 8 mm; Thread Length: 40 mm; Pitch Size: 1.25 mm. Package Included: 10 x Button Head Socket Cap Bolts Screws (M8 x 40mm bolts) RUGGED AND DURABLE Button Head Socket Cap Bolts Screws made of high-quality 18-8(304)Stainless Steel，which has higher corrosion resistance and anti-rust effect than ordinary bolt, longer service life, not easy to damage, more solid. INTIMATE SERVICE - YIIFLY focus on customer satisfaction, if you have any questions or are not satisfied, you can contact us by email, we will solve all your problems as soon as possible.