Shurlok has designed an all-metal key storage lock box that is the safest most secure lock box on the market, Separate combinations open the shackle and key compartment - and the combinations can be changed in seconds, The ShurLok can be secured with the shackle over any door knob or use the shackle to attach to gates etc, Also optional accessories such as the patented LeverGrip Bracket and cable allow even more flexibility where ShurLok can be placed, The lock box is so simple to use a child can open it yet so versatile it will satisfy anyone from home owners to boat owners from construction workers to maintenance people, All Metal No plastic buttons exposed to climate conditions!Zero Locking Open the ShurLok in the Dark! Simply roll the dials up until they stop at zero and then count your numbers up from there, SKU: FJM004