Door Security Bar -- theBulldog Basic Bar A Residential Door Security Bar that offers an increased sense of safety & a versatile design Engineered with solid steel & does not require electronic operation! Easy operation because you put it up and take it down manually. Fits most standard sized doors & can be used for sliding-door or hinged-door application Adds to the esthetic value of your home Simple to install and operate. We offer a video tutorial of how to install and operate your new home door security bar system!