Steel body: Tough and sturdy - suitable as an outside letter box: resistant to rust and light weathering. Bottom drainage holes prevent water build-up.Lockable: Wall mounted letter box keeps your delivered post safe, only you can access. Two keys included.Three side windows: Easy to see when post is inside this black letter box. Convenient - saves you opening post box to check.Quick and easy setup: Lockable post box set comes with screws, expansion plugs and protective pads. Everything you need - simply choose spot for outside letter box and fix into place.Dimensions: 29H x 36.5W x 11.5Dcm. Inner: 23H x 34W x 9Dcm. Post slot: 35L x 2.5Wcm.