The Hitec OEM Servo Arm Set (B25T Spline) is designed as original equipment for specific Hitec servos, including the HS-65MG and HS-65HB models. This set is also compatible with other models such as the HS-56HB, HS-125MG, and HS-5125MG. Constructed from durable nylon, these servo arms ensure reliable performance and compatibility with the designated spline size.