This flexible door/window cable restrictor is the perfect solution for providing restricted opening of windows or doors. Specially designed to protect children from falling out of windows. It also provides additional security, restricting window opening prevents burglars from using the window as an access point. This restrictor is very easy to install and comes with with four steel screws for mounting. Suitable for most types of windows and small doors. Perfect for home, public and commercial applications. Product Description Chain / Steel Window Hardware Chain Lock Hardware, Family Protection, Sliding Doors and Windows, child lock Security locks for casement windows, anti-theft deduction locks, hot-link anti-theft Advantage: Limits the number of windows that can be opened Improve air circulation, keep children safe Provides extra security to ensure family safety. Easy to install, installed on the door or window, effectively prevent the intrusion of strangers Specification: Color: brushed surface Chain material : High quality 201 stainless steel Material: stainless steel + zinc alloy Latch size: 47 x 22 x 20mm (1.8" x 0.8" x 0.8")< /p> Plate size: 47 x 12 x 1 0mm (1.8" x 0.5" x 0.4") Chain Length: 6" (150mm) Chain Thickness: 0.1" (2.8mm) Screw size: 15mm / 12mm (0.6" / 0.48") Weight: 130g Package includes: 1 x window lock keys Screw set