This reinforcing bracket is specially designed for the Walkera Runner 250 (all versions). It helps protect the motherboard from buckling during collisions or hard landings. The bracket also keeps the battery centrally located and prevents it from sliding forward in collisions. This protective gear has been sold many times before, but now is the time to get it for free. For the best fit, it is recommended to use three screws (2.5 x 12 mm) made for plastic.