The RTE-001S by CDVI is a surface mount exit button that follows the standard UK back-box format (85x85mm) for quick and easy installation. This plastic exit button provides a sturdy solution for door releasing in indoor environments. The RTE-001S is a surface mounted model and follows the standard UK back-box format, making installations quicker and easier. This button is suitable for low-to-medium traffic use. Sturdy plastic exit device Surface mounted with standard UK back-box format Suitable for internal use only