The LOX Locking LOX-ES10 is the non-monitored version of the ES10 strike. This lock is designed to be morticed into a door frame on a single swing door equipped with either a mortice lock or a cylindrical tongue lock. The ES10 is pre-drilled to accomodate for extention lips and is easily interchangeable from fail-secure to fail-safe with the use of a small screwdriver.