4-piece sliding window security locks with steel thumb screws — adjustable, no-drill installation Why you need this Prevents accidental openings by children or pets while allowing controlled ventilation. Adds reinforced security against forced entry for ground-floor windows or units in multi-family buildings. Maintains window ventilation and clean sight lines without permanent modification to the frame. Key benefits and how it solves problems Child and pet safety: stops windows from being opened wide enough for falls or escapes while still permitting fresh air. Theft and intrusion deterrent: the sturdy aluminum body combined with a steel thumb screw increases resistance to forced entry. Preserves ventilation: locks sliding windows in both fully closed and partially open positions so you can balance airflow and security. Easy installation: designed for no-drill installation so you can add security without altering the window frame. Features Pack: 4 locks included for multiple windows or backup/rotation. Material: corrosion-resistant aluminum body for durability and unobtrusive appearance; steel thumb screw for secure tightening. Design: adjustable stop mechanism to set the maximum opening width; secures sliding windows in closed and partially open positions. Installation: no-drill installation (mounts without drilling into the window frame) for renter-friendly use and quick setup. Appearance: low-profile design preserves clean sight lines and minimal visual impact. Compatibility and performance For use with sliding windows (horizontal slider type) in residential and light commercial settings. Suitable for single- and double-track sliding windows where a removable stop or additional lock is needed. Corrosion-resistant materials deliver reliable performance in interior applications and sheltered exterior exposures. Practical use scenarios Childproofing: Install on bedroom or nursery windows to prevent children from opening windows wide enough to climb or fall out, while still allowing airflow. Pet safety and ventilation: Secure living-room or kitchen sliding windows to keep pets from pushing a window open while keeping a small opening for ventilation. Ground-floor business security: Add to staff-room or storefront side windows to limit opening range for daytime ventilation while deterring opportunistic entry. What’s included Four adjustable sliding window security locks with steel thumb screws and corrosion-resistant aluminum construction. Each unit secures sliding windows in closed or partially open positions and installs without drilling. This product provides a practical, reversible way to improve sliding window safety and security while preserving ventilation and appearance.