4-piece set of adjustable aluminum slider window security locks with steel thumb screws Key benefits Prevents accidental openings: stops children or pets from unintentionally sliding windows open. Allows controlled ventilation: secures windows in fully closed or partially open positions so you can air rooms safely. Deterrent to forced entry: sturdy aluminum construction reinforces window security while keeping daily use convenient. Easy installation: drill-free mounting with a steel thumb screw and adjustable design for quick, tool-free setup. What it is and how it works Each pack contains four adjustable locks that clamp to most sliding window tracks without drilling. A steel thumb screw provides simple hand-tight fastening and easy adjustment to set the exact opening width you want. Corrosion-resistant aluminum body maintains clean sight lines and long-term durability in indoor environments. Compatibility and performance Designed for sliding windows in residential and commercial settings. Adjustable design fits a range of track widths; secures windows in both closed and partially opened positions to balance safety and airflow. Corrosion-resistant materials ensure reliable performance over time without rusting. Practical use scenarios Home safety: install on nursery or bedroom windows to prevent toddlers from opening them while allowing fresh air. Pet protection: keep living-room or porch windows partially open for ventilation while preventing pets from pushing windows wide. Commercial/office use: secure ground-floor or back-office sliding windows to reduce unauthorized access while maintaining ventilation. What you get Four adjustable aluminum slider window locks with steel thumb screws, ready for fast, no-drill installation. A simple, durable solution to improve window safety and airflow without altering the window frame.