Avoid slamming and preserve your sliding patio doors from over abuse and over extension. These rubberised bumper stops fit most sliding upvc patio doors and can be fitted easily in the sliding channel of most types of sliding patio doors. This black moulded door stopper has a rubberised black end for shock absorption and two dowel pins for steadying the bumper. These black door stops are fitted using a self tapping screw and two are recommended per door.