Product description Material: iron Size: 6*3.7*2.3cm Color: black Quantity: 2 pieces Package contents: 2 * child locks for sliding doors and windows 1. [Clamping distance of the attachable area of window lock stopper]: The sliding door or window frames must have the appropriate clearance. With a rotary 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 from being scratched. 2. [Double glass door locks] ： Double glass door locks can be used for large doors or windows, improve security. It will be more sturdy, firm and stable, crafted by hand, can be reused many times 3. [Easy to install] ： No need to install other tools, each window lock rotary button can be fixed with one hand. Designed for horizontal/vertical windows and sliding glass doors, but not for plastic window frames. 4. [Metal stopper on the lock body]: It is sturdy and durable, easy to install and use with one hand. 5. [Wide range of uses]: It can be easily applied to most environments. By partially opening and closing windows, burglars and thieves can prevent children from falling and protect the safety of family members while improving air circulation. It can prevent children from opening the window is too large to be dangerous, but also prevent children from opening the sliding door to reflect something.