This is an Aluminum Servo Saver Arm for the PRO-MT 4x4. Pro-Line has a new upgrade part for the Pro-Line PRO-MT 4x4 - Aluminum Servo Saver! The Aluminum Servo Saver Arm adds Strength, Durability and Style to a very important part of your truck. The Servo Saver Arm is CNC machined Aluminum and Gunmetal Anodized to perfectly match the rest of your truck. The Servo Saver Arm is a direct stock replacement upgrade for your PRO-MT 4x4 and will enable you to tighten down your servo saver spring for a more precise steering feel.