SeaSucker Dry Box - Horizontal Mount Large. It seals tight to keep water out and it holds firmly to your dash or other horizontal surface with our powerful 4.5in SeaSucker. Two clips snap tight to keep the lid closed. Specifications for SeaSucker Dry Box - Horizontal Mount: Manufacturer: SeaSucker Size: Large Width: 8.25 in Height: 6.5 in Depth/Thickness: 4.5 in Package Contents: SeaSucker Dry Box - Horizontal Mount SeaSucker MB5501: Dry Box - Horizontal Mount Large