Set of locks for sliding windows: You will receive 4 pieces sliding window lock. Size specifications: The sliding window lock consists of a hex key, a lock body and a lock cylinder (size as the picture shows) 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 punched window lock, yellow plastic handle design gets you off to a better start. 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 the installation is quick. Wide range of applications: Sliding window locks are suitable for all kinds of sliding windows and sliding doors to improve family security. (Noticed : Does not apply to middle window track) Package contains: 4 PCS window lock!