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 dont 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