The LokkLatch PRO-SL is a commercial grade self-locking security latch for general-purpose gates. Not only can this lock be operated and locked from either side of a gate, when the latch closes it will lock automatically for added security. As the latch automatically locks, a key is required to enter and exit, providing an extra dimension of security and making LokkLatch PRO-SL the ideal choice for installation in apartments, condos, gated communities, commercial and other security-conscious properties.The LokkLatch PRO-SL with strong, molded polymer construction with stainless steel components, takes an innovative approach to the gravity latch principle and combines the unique benefits of key-lockability and reliable latching action with superior design and rust-proof components. The External Access Kit allows the gate to be opened and locked from both sides of the fence.LokkLatch PRO-SL can be installed onto posts ranging from 1-1/2" (38mm) to 6" (150mm).  It comes in two models suitable for mounting on metal and wood or vinyl materials, and fits both right and left-handed gates.