[Durable and Waterproof]:This suggestion box is made of quality pp,ensuring its durability and longevity.The two parts of the box are tightly connected by screws through round holes,making it waterproof.The majority of the box is formed in single piece,with no connecting seams,ensuring a truly waterproof design [Clear View Window]:The suggestion drop box features a clear view window that allows you to easily see if there are any items inside This window is sealed with a transparent cover for added [Secure Locking Mechanism]:Each Comment box comes with a built in rotating lock for added security.Each lock is also equipped with two keys,providing convenience [Product for Dimensions]:The for dimensions of this mail box are 210mm in length,110mm in width,and 290mm in height; the input port measures 135*6mm - great for collecting suggestions or complaints from customers or employees [Package Includes]:Each package includes 1pc suggestion box,two screws for assembly,and two keys for the lock - everything you need to set up your new secure collection point