Rokk Mount Part #: AM-502-BKS Designed with the sea in mind. Scanstrut"s Rokk Mount designed specifically for Garmin"s GPSMAP 400 & 500 Series, Garmin"s echo™ 100-550 Series and Garmin"s Fishfinder 90, 140 and 400. A multi-position mount for small electronic devices onboard. Install fishfinders and chartplotter at the helm, RIB console, fishing boat dashboard, nav station and more. Features: One-handed quick release lever, unlock, reposition and lock again Marine grade machined aluminum, anodized for a durable, impact resistant finish Ball and socket system gives smooth, secure adjustment Locking lever design provides a rock solid platform and a high clamping force To install on rails: Simply unscrew base and fit to Scanstrut Rail Mount accessory 360 degree rotation 180 degree of swivel/tilt