Original Name / Part No.: 7729+7730+7732+7737+7752Part location: Upper & lower arms (F+R), c hubs, knuckle arms (F+R)Product major functions & usage:1. Support and stabilize front and rear chassis, improve steering performance.2. The smooth swing of the upper and lower arms helps the vehicle to perform in best shape.Accessories:Upper Arm 4pcsLower Arm 4pcsFront Knuckle Arm 6pcsFromt C Hub 2pcsRear Knuckle Arm 2pcs4x48.5 Steel Pin 4pcs4x85 Steel Pin 4pcs3x7x2 Shim 16pcs4x25 Round Head Screw 4pcs3x8 Flat Head Screw 16pcs4x37 Stainless Steel Button Head Screw 2pcs3x8 Round Head Screw 4pcs4x45 Steel Pin 4pcs4x43 Steel Pin 4pcsStainless Steel Large Head Screw 16pcsHow: Adjust the tie rods of front and rear upper arms.Purpose: Adjust the length of front and rear upper arms.Major advantages of upgrading to this part/product:1. Made with a quality light weight high tensile strength aluminum 6061 T6 for greater durability and more stable to use. The middle part of upper arm has upgraded to #45 steel to so the arms are stronger and prevent collapse but keep a light weight at the same time.2. Knuckle arms and c hub are inserted with POM collar so the axle rotation and the upper and lower arms swing more smoothly.3. Upper arms used a tie rod design with counter-clockwise threads in order to adjust the length to suit different road condition.