Stainless Steel Material : Made of rust resistant 304 stainless steel superior rust and erosion resistance. Suitable for indoor and outdoor use, maintaining long-lasting durability and sleek aesthetics. Set Contents : Includes 5 left opening and 5 right opening window stoppers , with a size of 85x50x2mm , accurately matching the opening direction of casement windows , effectively controlling the window opening angle to stop over opening Safety Protection : It can limit the maximum opening width of windows to meet the safety protection needs of family children and avoid the risk of accidental falls , especially suitable for high rise residences , schools , hotels and other places Easy Installation : Each set contains 10 stoppers and 40 matching screws , no additional tools or parts are required , and the installation can be completed quickly with an additional electric drill , saving time and effort Wide Compatibility : It is suitable for various casement window systems such as aluminum alloy , plastic steel , and aluminum with broken bridges , and is an ideal accessory for door and window maintenance , home improvement upgrades , and safety renovations, Manufacturer: PATNFR