Security window screen has stainless steel or aluminum alloy security screen. Stainless steel security screen has better anti-theft effect; aluminum alloy security screen has lighter weight and never rust advantage. With the thick black powder coated surface, the security screens are corrosion resistant. Because of high security and good ventilation, security screens are widely used as window screens and door screens in residential or business areas to prevent thieves. Besides, they also can be installed for separating swimming pool from outside to prevent mosquitoes, flies and other insects.