Made of aluminium alloy material, small density, good thermal conductivity, good corrosion resistance and high strength. 4-digit combination lock to ensure security, holes can store up to 5 keys. It has a robust push button code on the box allowing access to your keys by those who you've told the code. Easy to install, all necessary mounting hardware is included, to ensure that the box can be mounted on any solid surface. Suitable for outdoor use, for children after school, cleaning or maintenance services, vacation properties and elder care providers. Specification: Condiiton: 100% brand new Color: sliver + black Material: aluminum alloy Size: (L) x (W) x (H) 115 x 95 x 38 mm / 4.53 "x 3.74" x 1.50 " Package Included: 1x Wall Mounting Key Storage Lock 1x 1x Mounting Screw Package English Instruction