Weather resistant storage for...Ahem…uh…whatever you might want to carry unobtrusively concealed. Perfect for registration materials or travel documents that you need secure yet accessible, and perhaps the spare hidden key. Sized to work with all standard size license plates on most motorcycles. Mounts either lock up or lock down — you choose. Includes all mounting hardware and two keys. Tough injection molded polypropylene and about 1" thick. 7"×4".