2 pcs Window Restrictor Locks Child Baby Safety Window Locks UPVC Cable Restrictor Locks with Keys for Home, Public, and Commercial Applications - White Premium Quality: Window fasteners for UPVC windows are made of ABS and zinc alloy, 304 stainless steel lock core, electroplated zinc alloy surface for enhanced safety and flexibility, corrosion-resistant stainless steel, and durable. Unique Design: Window locks with a special restrictor design, a 19cm safety cable, provide an 11 to 16cm restriction, allowing fresh air in. The window can be fully opened after the cable is removed from one end using the key. Easy to Install: Equipped with self-adhesive glue on the mounting pad for drill-free installation, making it simple and convenient. Note: You must wait 24 hours after installation is complete. Wide Range of Applications: Used in homes, hospitals, schools, universities, and offices. It is widely used in casement windows, hopper windows, tilt-and-turn windows, sliding windows, etc.