Adjustable thick sliding door window lock stopper, anti-theft security, child safety, plastic, steel and aluminum free rails, window limit, anti-slip door.

Safety: To prevent accidental falls of children, prevent children from accidentally opening.

Security: To prevent theft, you can lock the window when it is ajar.

Ventilation: Keeps the air fresh and ventilated inside.

Appearance: Professional surface treatment, solid, concise and aesthetic; Using high-quality materials, easy to open, suitable for most plastic-steel alloy windows.

Function: The secondary lock provides additional security when ventilating or securing your sliding door or window.

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