"The BeatDown Outdoors The Flex Sonar Fold-Down Mount with Double Stack gives you a rock-solid mount produced with the same quality and craftsmanship you know and trust from Beatdown Outdoors. The Flex has a specialized design that's perfect for fishermen looking to get their sonar units up off the floor for easier viewing and less hassle with its easy adjustability. A quick turn of the base knob lets you raise the mount from a flat position to a vertical position to view your graph. After you tighten that knob, turn the pivot knob which allows you to raise the mount from 17"" up to 28"" and rotate your graph 360 for an optimal view of your graph from anywhere in the boat. The Double Stack lets you use 2 graphs on your Flex with the same rock-solid dependability. It mounts onto your Flex in seconds to give you twice the device-mounting power. When you're ready to step up your angling game, it's time for The Flex Mount with Double Stack. Ultra-durable construction Flex mount lets you raise and lower your graph to the deck of the boat Double Stack gives you twice the surface area to mount 2 devices"