BQLZR Purple N10065 Aluminum Alloy 25T Steering Servo Horn Arm 3.5cm for RC1:8 1:10 Model Car Durable Fit for 1:8 1:10 model car Made of Aluminum Alloy. It is long lasting and easy to install. Hard anodized aluminum construction Compression mount, two screws install on either side of arm and tighten center hole around servo spline