Sturdy Material: allows our lock box protects your key from being damaged by hammer, saw, drill and so on. the Instruction guide takes your through steps to re-set your access code at any time. Easy to install: Install with pre-drilled holes is super easy. secure storage: Outer dimensions: 114mm long, 94mm wide, 40mm thick, can holds up to 5 keys Colour: Black,Gray Material: Zinc alloy + ABS plastic (the shell is composed of plastic) Instructions for use: 1.Pull the weather cover down to reveal the dials. 2.Rotate dials to the current combination 3.Pull the door fully open and add or remove the keys. 4.Close the door, realign the combination dials to lock the door and conceal your combination. 5.Close the weather cover. Inner Size: .90*62*30mm note: 1.Keep the weather cover closed to increase weather resistance. 2.We do not recommend use the combination such as "A-A-A-A" which is easy to crack. 3.It is recommended the dials are rotated weekly to keep them moving freely. Package Contents: 1 x Key Storage Box 4 x screws 4 x Expansion tube 1 x User Manual(English) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.