Accessories:Gearbox Cover-2pcsStainless Steel Round Head Screw 3x16-12pcsManual number:8541Product major function & usage:Stabilize the bearing and diff gearsMajor advantages of upgrading to this product:1. Made with a light material with high tensile strength aluminum 6061 T6 for more sturdy and great durability.2. Accurate bearing position to ensure the diff gears are running stableand smooth.3. Installation: To pursuit the most precise position and minimize the gap in between bearings, it is recommended to use screws to tighten the position instead of pressing by hands.We use a quality light weight high tensile strength aluminum 6061 T6 and is then anodized with scratch resistant colorsWe also have a big selection of multiple colors available now!! Let¡¯s ¡°hop up¡± your vehicles to give them the best looks and performance on the market ¡¦ colors are available in blue, red, grey silver/gun metal, orange, green, black, brown