Now there is a new type of security window produced by Century Kunning Doors and Windows Company, which is very good, not only can be opened freely, but also does not occupy space after opening; The steel ring is hard and slender after cold drawing. Not only can it not be cut with ordinary tools, but it will not block the sun after it is closed! Invisible collision lock, the structure is honeycomb! The anti-theft performance is unmatched by others! The appearance is electrostatic spraying, which is beautiful and does not rust. Colors are optional!