The Master Lock 5414E Portable Shackled Reinforced Security Key Lock Box has a solid zinc body with dual locking levers. It can easily hold keys in a convenient location for regular use or can be portable. Lock in place over the door knob or handle for convenience. Set-your-own 4-digit tumbler combination for convenience and quick access. The 5415E can be used both inside and outside the home, office, worksite or anywhere that restricted or safe access is required. You can safely leave keys for children to get in after school so you don't have to be there to let them in. For an elderly family member you need to visit on a regular basis, or for just storing keys safely just in case you lose them on your travels. All Master Lock products with a locking mechanism have a Lifetime Warranty against mechanical failure. Features: External Dimensions: 131 x 190 x 53mm.Internal Dimensions: 65 x 96 x 35mm.Shackle Diameter: 10mm.Shackle Clearance: 36mm.Shackle Width: 47mm. Ref: UTTK13889