Master Lock 5401D Set Your Own Combination Wall Mount Lock Box, 5 Key Capacity, Black Large capacity key lock box enables secure storage of up to five keys; designed for installation to a wall or fixed object Set your own four-digit combination lock box; Reset the combination for thousands of personalized combination code options For indoor and outdoor use; key safe is constructed with a metal body for durability and shutter door to protect combination dials from weather Exterior dimensions: 4-3/4 in. (12 cm) H x 3-1/4 in. (8.3 cm) W x 1-1/2 in. (3.8 cm) D Interior dimensions: 3-1/4 in. (8.3 cm) H x 2-1/4 in. (5.7 cm) W x 1 in. (2.5 cm) D; 7.3 cu in. (18.5 cu cm) volume