Product Name:Cup head bolts Material: 12.9 grade alloy steel Size: M3 M4 M5 M6 M8 M10 M12 Length: 6mm-50mm Metric thread pitch: 0.5mm(M3)/0.7mm(M4)/0.8mm(M5)/1mm(M6)/1.25mm(M8)/1.5mm(M10)/1.75mm(M12) Note: 1.Due to guide measurement, please allow slight errors. 2.Due to variations between assorted displays, the images may not replicate the particular shade of the item. 3.If you've got any questions about the product, please be at liberty to contact us. We will offer you a respond as quickly as possible. 4.We not just do retail, But also do wholesale,If you desire to purchase huge quantity,please contact us.We will calculate the main points and give you a reputable price. 5. Thank you greatly to your support. Have a nice shopping!