Over 10 years or reliability and durability10,000 possible combinationsThe only lock box with one combo to open the shackle and another to access the key doorNo front lid to fall offNo START-OVER like in old dial-systems, if you mess up one number, simply fix that digitIndustrial Strength Craftsmanship Chrome-plated brass dials, solid metal body, hardened steel shackle, and a protective backSafe at night with zero-locking; Roll the dial up and away from you to zero, then count the numbers upOpens first time, every timeRecombinate in secondsApplicationsAfter School Access for ChildrenEasy Access for Friends and Family Key Lock BoxMaintenance People & Cleaning Personnel Key LockboxEmergency Access for the ElderlyConstruction Sites & VehiclesContractors & SubcontractorsRecreational VehiclesBoats & Boat LockersBicycles and Motor BikesVacation Properties & Rentals Key LockboxesGreat for Joggers & Outdoor SportsReal Estate Key LockBox & Property Management KeyAnd anywhere having access to keys unattended is a prioritySpecsShackle width 7/32Shackle width with protective cover; 7/16Height 1-5/8Width 1-3/8Body Width; 2-1/2Height (shackle & body); 5-1/2Key Compartment; 1-3/8Height Width (fits up to 5 keys); 9/16