Anodized 6061 aluminum alloy, T6 heat treatment, high strength, thread, not easy to slipThe set of screws weighing 17 grams will not increase the weight of your vehicle.Note: The outer screw cover is a reverse thread, clockwise is loose, counterclockwise is tight, the inner screw is positive thread, clockwise is tight, please pay attention when installing and removing.Specifications:Type:/M30Weight:17gColour: BlackMaterial: Aluminum alloyPackage Contents:1 x screw toolOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.