Sturdy Material: The Window Restrictor Lock is made of stainless steel metal material, which is strong, durable and firm. The chain is coated with a protective layer and has a long wear resistant life.Scope of application: Window Lock is suitable for most families. It does not require a window, and the ventilation spacing can be freely set. It can be used for both sliding windows and sliding windows.Security Window Lock: The Window Chain Lock is fixed with screws, comes with keys and screws, complete accessories, and is easy to install. Fits most doors and windows. Prevents your children from opening windows by mistake.Easy to Install: The Sliding Door Lock can be easily installed using drilled screws, the buckle is tight and firm, and it will not loosen when pulled hard.Multi Purpose Use: Security Lock is ideal for a variety of environments, including homes, public places, , hotels, schools and commercial applications. Specification: Material:Stainless Steel Size Chart: 22cmx5.2cm/8.66inchx2.05inch Package Includes: security lock2 keys5 screw accessories Note: 1.This is not infant toy, please take away from children to avoid eating.2.Please allow slightly errors due to manual measurement and different monitors. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.