KEEP CHILDREN SAFE: The safety lock can help keep sliding windows locked, prevent children from falling, and prevent others from invading.SUIT FOR MOST DOORS AND WINDOWS: The security stopper is equipped with a rotary switch, easy to change the card slot distance (0.98inch/2.5cm-1.57inch/4cm), suitable for the most windows and doors.WILL NOT SCRATCH WINDOWS: With a flexible protective cover, the window lock is non-slip, will not scratch the window card slot.PACKAGE INCLUDED: 2 x safety lock. Size: 2.36*1.38*0.91inch (6*3.5*2.3cm). Material: iron. Color: blackFRIENDLY CUSTOMER SERVICE: If there is any question, welcome to contact us, we will fix it.Product The reusable safety lock, easily stop your toddlers and dogs opening all kinds of sliding doors or windows, keep them safe.Easy to use and remove.How to use:1. Lock the window before installation.2. Insert the tab of the lock into a groove and attach it tightly to the interior frame.3. Turn the knob clockwise until the lock is locked.Specifications:Material: IronSize: 2.36*1.38*0.91inch (6*3.5*2.3cm)Color: blackPackage included: 2 x security lock