Secure your trailer with this lock-arm stabilizing bar. Easy to install and reliable. Eliminates most trailer movement from your trailer's existing stabilizing jacks. Adds support from the jack leg or foot to the trailer's frame. Unique swivel mount adapts to most crank-down trailer jacks and works at various jack angles. Uses 3/4" crank handle (not included) to lock and unlock Lock-Arm. Simple one-time, bolt-on application. Two lock-arms and complete mounting hardware included. Mfr. lifetime warranty. Unit Weight: 4.76 lb Brand: BAL MFG Part No.: 23216