Two Colour Options: Choose between black or silver. Combination: The 4 digit combination can be reset as needed for enhanced security, lock offers 10,000+ possible combinations. Size: External size: 133x92x49mm, Internal size: 111x80x22-44mm. Waterproof: The waterproof cover protects the lock box and any stored keys from outdoor elements. Key Safe Box: Get a 4 digit combination wall mounted key safe box. Material: Made from aluminium alloy, steel, and TPE. Wall Mounted 4 Digit Combination Key Safe Box | Black | Living Social