This is an optional HPI Aluminum Steering Arm, and is intended for use with the HPI Baja 5T. The Baja 5T Aluminum Steering Arm for HPI SFL-10 Servos is now available as a spare part. This aluminum steering arm is built extra tough to handle the demands of 1/5th scale vehicles. Use it as a replacement part on the Baja 5T HPI SFL-10MG2 servo, or as an upgrade to the stock plastic servo arm used on the SFL-10 and HPI SFL-MG servos. HPI recommends upgrading to the metal servo gears if upgrading the stock plastic servo arm.