ShurLok SL-200W 4 Dial Numbered Key Storage Combination Lock Box, Black

The ShurLok offers a superior key storage solution to other products on the market.With 10,000 possible combinations it is far more secure than plastic push button locks that are not sequential (opens in any order just so 4 out of 10 buttons are pushed).The ShurLok's patented dual function on one set of dials allows one combination to be used for the key compartment (which you give to others) and another combination be used for the shackle (you keep)