This system includes :Knuckle Arm-2PCSStainless metal Round Head Screws 3x14-1PCSStainless steel Flat Head Screw 3x14-2PCSLock Nut 3mm-3PCSOriginal name / role No:42062+42064stabilize the CVD, assist the steeringMajor advantages of updating with this specific part/product :1.Made with a decent lightweight high tensile power aluminum 6061 T6 for great durability.2.Hand-inserted Delrin collar actually really helps you to reduce any extra room.