Accessories:Servo Arm-1PCSStainless Steel Round Head Screws 3*8-1PCSStainless Steel Round Head Screws 3*14-1PCSOriginal Name / Part No:8247Product major functions & usage:1. Made of aluminum 7075, compare to the plastic made material, it is more durable and stronger with straight arm design.2. Dual holes design for tie rods adjustment.