Set of locks for sliding windows: You will receive 4 pieces sliding window lock. . Size specifications: The sliding window lock consists of hex key, lock body and lock cylinder the total length of hex key is 49mm, lock body size is 30*24 *24mm and the diameter of the lock cylinder hole is 10mm. . Aluminum alloy material: these window locks are made of aluminum alloy, thickened material, anti-corrosion and anti-rust, not easy to deform. Easy to Install: No perforated window lock, yellow plastic handle design makes you start better. When installing, just insert the hex key into the hole, determine the installation position on the window rail, turn the key to adjust the window lock to fix it and remove it. installation is quick. . Wide range of applications: sliding window locks are suitable for all kinds of sliding windows and sliding doors to improve family safety. (Remark: Does not apply the middle window track) .