... steel, an ordinary plane type, prevent slippery tooth type and cross-section type I. Common specifications have 20 * 5, 25 * 5, ... against theft, safety, opens conveniently.5, saving investment: big cross, an overloaded, than iron price low and save stolen or ... has anti-theft functions. br /> Uses:Widely used in municipal road, garden facilities, residential quarters, school, gym tube different sites. ...