Do you want a kind of professional lock for your sliding window? Do you want to keep your door childproof fixed at night? This can be your . Really practical and useful, just install it onto your window or door. Features - Color: Black -Material:Aluminum alloy, rubber - Size: 5.90X4.00X3.80cm/2.32X1.57X1.49in Suitable window/door slide thickness: 0-2.5cm Suitable track thickness: 14mm-30mm (inner clamping)/25mm-42mm(outer supporting) - It can prevent children from opening the window too large and cause , and it can also prevent children from opening the sliding door and flipping things around. - When the weather is stuffy, it is not safe to open the window at night for ventilation, and it is safe and convenient to lock the window with an auxiliary lock for ventilation. - Thickened aluminum alloy material, durable, suitable for all kinds of sliding windows and doors, effectively preventing accidents caused by children and unintentional opening of windows in strong winds. - Non-slip rubber pad, safe and stable, can be used directly without drilling installation, metal anti-skid rubber pad, strong durability. - Both upper and lower rails can be used, both upper and lower rails can be used, and the two together are more stable. Package list: 1 x sliding window lock