The master lock 5414e portable shackled reinforced security key lock box has a solid zinc body with dual locking levers it can easily hold keys in a convenient location for regular use or can be portable lock in place over the door knob or handle for convenience set your own 4 digit tumbler combination for convenience and quick access the 5415e can be used both inside and outside the home office worksite or anywhere that restricted or safe access is required you can safely leave keys for childre