The Restrictor rope lock prevents release of a rope when an out-of-balance condition exists. If the operator cannot overcome the imbalance by physical strength, the rope lock will not disengage. The handle and can design enables the lock to remain closed without the use of an oval ring. With all steel construction and 4½"-long shoes that grip the rope, it is the strongest rope lock on the market, according to Tiffin Scenic Studios. It can mount on a standard locking rail.