Abstract: An anti-theft security system for boats on boat lifts, which also provides for stability to eliminate boat swaying on the lift during wind storms. The system includes two opposing secondary side rails configured to move laterally along an underside of the primary boat lift I-beams. The side rails are interlocked within receiving brackets mounted to the boat lift posts, using a locking device that locks one of the side rails to the post mounted brackets on the dock pier side. The opposite secondary side rail includes an attached pull bar that allows a person to place the rail in position for locking or to pull the opposite side rail away from the lift posts to lower the boat into the water. The pull bar handle is interlocked with the rail nearest the dock pier side.

Abstract: An anti-theft security system for boats on boat lifts, which also provides for stability to eliminate boat swaying on the lift during wind storms. The system includes two opposing secondary side rails configured to move laterally along an underside of the primary boat lift I-beams. The side rails are interlocked within receiving brackets mounted to the boat lift posts, using a locking device that locks one of the side rails to the post mounted brackets on the dock pier side. The opposite secondary side rail includes an attached pull bar that allows a person to place the rail in position for locking or to pull the opposite side rail away from the lift posts to lower the boat into the water. The pull bar handle is interlocked with the rail nearest the dock pier side.