The RAM Lowrance Quick Adaptor includes a 1″ diameter rubber ball and inserts directly to the back of Lowrance Elite 4, Mark-4 & Hook 3 / 4 Fishfinders (not Hook2 series).
RAM Lowrance Quick Adaptor
The RAM 1″ Lowrance Quick Adaptor serves as a quick release mechanism, allowing you to remove or transfer your fish finder in seconds.