Dimensions: 21 cm x 4 cm x 1.9 cm 【Protective Function】 Ideal for preventing babies and toddlers from wandering outside or crawling among your belongings, this lock will keep them safe. It limits how far a window can open and is specifically designed for child safety. Effectively protect children and family members and prevent damage to family property. 【Multiple Applications】 This window restriction lock is ideal for use in homes, apartments, schools, universities, offices, shopping malls, and various public places to create a safe environment for your children and other family members. It is also suitable for many cabinets, drawers, and doors. It can also be used in various locations such as bedrooms, living rooms, workspaces, sliding doors, windows, and for general household use. 【Smart Design】 Can be locked and unlocked as needed. The window lock features a special limit design with a 20cm cable, allowing fresh air to enter. When the cable is in place, the window's opening distance is limited. The window can be fully opened once the cable is removed from one end using the key. 【Sturdy and Exquisite Lock】 Thick zinc alloy base, robust and durable; external plastic casing for sun protection and oxidation resistance; integrated stainless steel cord for strong corrosion resistance; new shape, smooth lines, can be bent as desired; the fixed end is thickened, providing both protection and aesthetic appeal. Universal key: one key opens multiple locks.