Garmin GPSMAP 176, 176C, 196, 276C, 296, 376C, 378, 396, 478

The RAM Marine Grade Aluminum Mount with Zinc Coated U-Bolt Rail Base consists of the 1" dia. ball and socket system with RAM Plastic Cradle for the Garmin GPSMAP 176, 176C, 196, 276C and 296, 376C, 378, 396, 478 & 496 models.Design:The Powder Coated Aluminum Rail Base has a 1.0" diameter Rubber Ball designed to sit at right angles to the mounting rail. The Zinc Coated metal U-Bolt and nuts included will fit a circular rail with diameter from 3/4\" to 1.0".For a larger rail, you can purchase the RAM-B-231LZS Large Rail Base for circular rails with diameter from 3/4" to 1 1/4".