Constructed with strong aluminum alloy, this mailbox provides convenience and security for complaint suggestion, mails, letters, interoffice mail and much more. What's more,it is lockable that ensure the letter will not be stolen. Features -Color:Grey,Transparent -Material:Aluminum Alloy -Size: About28.50X21.50X10.50cm/11.20X8.45X4.13in - Made from superb materials, safe and long service life. Widely used for office, factory, school, work unit, etc. - The appearance design of the product is simple and generous, you can use it in many places. - Can effectively help keep the confidential information of mail and complaint suggestion. - You can put many mails and letters what you need due to the large capacity. - The holes on the back of the box make it can be hung on the wall or other places more easily. Packing list1 x Suggestion Box