Product Details: 1. Must be vertical to the spools of thread are screwed, do not tilt; 2.In the screwing process, rotation force must be uniform, tightening torque can not be more than safe torque; 3.As much as possible using torque wrench or socket wrench, avoid the use of movable wrench or electric wrench; 4.Avoid use under the condition of high temperature, use don't fast rotation, avoid rapid temperature rise and cause the lock. Type: flat end Color:black/Stainles steel Material: Carbon steel Category: hex socket Fastening screw Package include: 200 x Black/Stainles steel headless screw M3 * 3 20 pcs M3 * 4 20 pcs M3 * 6 20 pcs M4 * 4 20 pcs M4 * 6 20 pcs M5 * 5 20 pcs M5 * 8 20 pcs M6 * 6 20 pcs M6 * 10 20 pcs M8 * 8 20 pcs 10 grid plastic box transparent 1PCS note: Since different computers display different colors, thank you for your understanding, the color of the actual product may be slightly different from the image. If you have any questions about this product, please feel free to contact us. We will reply to you as soon as possible. Thank you very much for your support. happy shopping!