The Master Lock 5406D lock box is a brilliant representative of security key holders created for your personal convenience. It helps to share the keys to a car or house with family or neighbors without reducing the level of security. Features: Provides reliable security thanks to 3-digit combination; Designed for "over the doorknob" installation; capable of accommodating two keys; allows for the comfort of regular use; Durable cover resists freezing, dirt and prevents jams; Specific shackle with vinyl finish prevents scratches. Dimensions: Body size – 2-3?4 inches; Interior Space: Width – 2-1?4 Inches, Height – 1 Inches, Depth – 3?4 Inches; Shackle Size: Width – 1-7?8 Inch, Height – 1-13/32 Inch, Diameter – 13/32 Inch. The spacious 5406D key box allows users to safely store keys in a reliable location and remain confident that they would get into the right hands. Durability, ease of use and reliable security are guaranteed.