norcoind.com/bal/products/consumer/stabilizing_products/lockarm.shtml • 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 ¾" crank handle to lock and unlock Lock-Arm. • Two Lock-Arms and complete mounting hardware include.