STANDARD METRIC: Our M8 screws correspond to the standardized metric system. Scope of delivery: M8 x 30 mm (20 pieces) / thread diameter: 8 mm; Pitch: 1.25 mm; Widely used; Commonly used in machinery, furniture, car and motorcycle repairs, and DIY inventions. Warm tip: The product contains small parts. Do not let children play to avoid accidental swallowing. We offer our customers high-quality products. For this reason, we employ professional customer service staff to ensure every customer's satisfaction. So if you have any problems after purchasing our product, please contact us. We are always here for you. MATERIAL: 100% 304 stainless steel (A2-70), high hardness, corrosion resistance, can be used in humid environments and do not worry about rust. STANDARD METRIC: STANDARD SIZE (Tolerance: ±0.005 mm): Uniform force, arranged in the center of the head without offset, not easy to slip; Uniform pitch, clear screw thread, no residual burrs, tight screw threads can achieve good adhesion.