Heavy duty key lock box for high security storage of up to five standard (2 in.) house keys; Shackle fits most ball, biscuit, and tulip door knob styles Set your own four-digit combination lock box; Reset the combination for thousands of personalized combination code options For indoor and outdoor use; Heavy duty key lock box is constructed with a solid zinc body for durability, vinyl coated shackle to prevent scratching, and protective door for better weather resistance SPECIFICATIONS: External Dimensions: 5.0 in (127mm) H x 3.18 in (80.80mm) W x 2.08 in (52.8 mm) D. Internal Dimensions: H 4.13 in (104.9mm) x W 2.55 in(64.77mm) x D 1.65 in (41.91 mm); Shackle Dimensions: 0.375 in (9mm) diameter, 1.438in (37mm) clearance, 1.875 in (48mm) wide Portable Key Lock Combination Box can be used for Home, Vacation Rentals, Businesses, Real Estate, Office, Gym, Hospitals, Schools and Warehouse.Removable Shackle is easy to install over a doorknob, fence, locker, gate, garage or anywhere you need to install a lock box, and it can be placed anywhere. Easily transportable from one location to another. A Removable Shackle makes it easy to place on doorknobs, a wide fence or anything that is oversized. Cover should be up to keep it the combination from getting jammed or stuck