Angler's Pal Multi-Mounts offers the flexibility to mount your fish finder/depth sounder anywhere in the boat for easy reading. They give you a 360 degree full hemisphere of possible positions. The units feature a universal ball locking device with a ""select position"" locking knob making them virtually vibration free. The Multi-Mounts are made of rust resistant stainless steel/black hard anodized aluminum for fresh and saltwater usage. An ""Allen"" wrench easily removes your fish finder/depth sounder for security or storage.