【Package Includes】4 window locks for horizontal sliding windows with adjustable knobs and rubber protective pads. Integrated design, no assembly required, simple and convenient. 【2 Installation Methods】 CLAMP MODE: clamp the window security lock on the track, suitable for tracks with a thickness of 1mm-16mm/0.04-0.63in; BRACING MODE: suitable for 2 tracks with a distance of 13mm-28mm/0.51-1.1in, 2 sliding windows can be fixed at the same time when propped open. Please measure the size before purchasing. 【Easy Installation】The window locks security are easy to install, no need to punch holes, saving time and effort. The large knob is easy to rotate and adjust. The window safety locks are also equipped with rubber anti-slip protective pads to prevent scratches on your windows and improve stability. 【Heavy Duty Iron Material】The window lock and sliding door lock are made of thickened iron metal, which are permanently sturdy and non-deformed. The anti-rust coating on the surface makes it corrosion-resistant and suitable for heavy sliding windows and doors. 【Security Protection】The sliding window lock is very suitable for different vertical and horizontal sliding doors and windows, sliding patio doors, sliding glass doors, etc., suitable for home, apartment, hotel, office, etc. The window stoppers security can freely control the size of the window or door opening, thereby preventing risks such as falling from height and theft., Manufacturer: LELE LIFE