This patio Door bumper is constructed from injected rubber. Using only a few simple tools, it attaches to the patio sliding door jamb to prevent the doors from slamming too hard against the jamb, when opened with excessive, miscalculated force. Each bumper is a 1 inch diameter and 2-5/8 inch long black rubber bumper with steel insert washer. These bumper stops come complete with installation fasteners to allow for quick and easy installations. For best results, follow the installation instructions included with each package.