This swing bar door lock is constructed from heavy-duty diecast zinc and comes plated in a brass plated finish. The long hinged bar folds over the closed door to engage the catch adding extra security to your swing-in door while allowing a safe viewing space and/or secure ventilation. This door lock includes a rubber bumper to prevent damage to wall and trim. All necessary fasteners including plastic shim spacers (for leveling, if required under mounting plates) are included, for a quick and easy installation.