The union strongbolt 5 lever mortice sash lock visi 65mm features an innovative easily reversible radius latch that uses the union switchlatch technology meaning that no tools are required this is both simple to use and time saving the sash locks have a radius inner forend for ease of installation they can be installed in the many uk mortices without the need for additional carpentry or spoiling the edge of the doorthe chamfered bolt design increases the performance of the lock under side