Designed for heavy-duty freshwater use, the RAM Double-Ball Mount from RAM Mounts provides a secure and stable hold for a Lowrance Hook fish-finder on your boat, kayak, or inflatable. The double-socket mount features a C-size (1.5") mounting ball and is made of corrosion-resistant composite and powder-coated marine grade aluminum. It's compatible with Lowrance Hook 4x, Hook 5, and Hook Reveal series.