The SeaSucker Large Dry Box is a safe storage option that doesn't require you to drill holes in your fiberglass. Simply vacuum the mount anywhere on your boat; it installs and removes in seconds without permanently damaging your boat. The Large Dry Box is big enough for your wallet, cell phone, camera, etc. It seals tight with a rubber gasket to make it watertight, and it holds firmly to your dash or other horizontal surface with the powerful 4.5" SeaSucker. Two clips snap tightly to keep the lid closed.• Overall: 8.25"W x 4.5"D x 6.5"H• Dry Box: 7.5" x 3.5" x 3.5"• Powered by powerful 120-lb. pull-strength rated 4.5" vacuum mount Big enough for your wallet, cell phone, camera, etc. Seals tightly with a rubber gasket to make it watertight Holds firmly to your dash with the powerful 4.5"" SeaSucker | SeaSucker Large Dry Box, Horizontal Mount