Thumbturn CH021 Contains a cover plate for the exterior side of the door. Thumbturn is covered by a plastic cover which can be broken in case of an emergency. The cover plate has multiple surface treatment options. Specifications Type of product Escutcheon/rose/handle Close Thumbturn CH003Thumbturn for solid doors and balcony door latches. Exit thumbturn CH006Exit thumbturn for solid doors. Thumbturn CH001Thumbturn for solid doors.