Master Lock Heavy Duty Wall Mount Key Box, Outdoor Mounted Lock Box for House Keys, Safe with Combination Lock for Landlords, Realtors, 5 Key Capacity, 5415DHeavy duty key lock box for high security storage of up to five standard (2 in.) house keys; designed for installation to a wall or fixed object.Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit.Note: Measure your door's backset, cross bore and thickness to ensure you find the right fit.Set your own four-digit combination lock box; reset the combination for thousands of personalized combination code optionsFor outdoor use; heavy duty key safe is constructed with a solid zinc body for high security and full weather cover to protect combination dialsExterior dimensions: 5.5in (13.2cm) H x 4.1in (10.5cm) W x 1.7in (4.3cm) D; Interior dimensions: 4.4in (11.3cm) H x 2.5in (6.4cm) W x 1.2in (3.1cm D)