The Keystone X-eXternal Mount Two-Sided and One-Sided Lockable Gate Latches are designed to be used with both right-hand and left-hand applications. Made from glass-filled nylon material for low maintenance, strength and durability. Two-Sided latch fits 2″ to 5″ square gate posts by cutting the marked stainless steel external spindle to size. Key lockable from both sides, locking the outside entrance button does not lock the inside gravity latch. One-sided latch includes latch side only, no external push button. Components are all rust-resistant including a stainless steel striker bar and catch. Thumb latch is on the bottom protected from the elements. The versatile latch can be used for vinyl, wood, and ornamental aluminum gates.