* Eliminates most trailer movement associated with existing leveling or stabilizing jacks. * Adapts to most crank down leveling/stabilizing jacks. * Installation is a simple one time, bolt on application. * Unique swivel mount works at various jack angles. * Telescopic Lock-Arm travels up and down with jack for easy set up and storage. * Uses 1/4 inch crank handle to lock and unlock Lock-Arm. * Two Lock-Arms and complete mounting hardware included.