Features APPLICABLE SIZE: The lock is 2.4 inche long, suitable for rails up to 0.4in wide (with rubber gasket) or maximum 0.67in (without rubber gasket). MAIN PURPOSE: This lock set is suitable for vertical and horizontal sliding door and window, to prevent thieves from entering or kids from falling off. EASY INSTALLATION: Use double screws to install on the sliding rail, and tighten with the hex wrench on the key, to prevent the glass door and window from sliding. ALUMINUM ALLOY: The sliding window lock is made of aluminum alloy, corrosion and oxidation resistance, can be used in various environments. RUBBER GASKETS: Equipped with rubber buffer gaskets to prevent scratches or damage to window, greatly improve door and window security. Specification: Item Type: Sliding Lock Set Product Material: Aluminum Alloy Application: Used for vertical and horizontal sliding window and sliding door, etc. Package List: 18 x Sliding Lock Accessories 1 x Bottle Opener Key Package List 18 x Sliding Lock Accessories 1 x Bottle Opener Key