Product description Material: iron Size: 6 * 3.7 * 2.3cm Color: black Quantity: 2 pieces Package content: 2 * child locks for sliding doors and windows 1. Window lock stoper attachable area clamping distance: Sliding door or window frames should have proper clearance. With a rotatable switch, the distance between the window card slot can be changed. Two feet with a flexible protective cover, non-slip and protect the window card slot is not scratched. 2. Double glass door locks Double glass door locks can be used for large door or window, improve security. It will be more sturdy, firm and stable, elaborately handcrafted, can be reused many times 3. Easy to install no need to install other tools, each window lock rotating button can be fixed with one hand. Designed for horizontal / vertical windows and sliding glass doors, but not for plastic window frames. 4. Stoper Made of metal in a lock body it is sturdy and durable, easy to install and use with one hand. 5. Wide range of uses: can be easily applied to most environments. By partially opening and closing the windows, thieves and thieves can prevent children from falling, and protect the safety of family members while improving air circulation. Can prevent children from opening the window is too big to be dangerous, but also prevent children from opening the sliding door to mirror something.