1UNIVERSAL COMPATIBILITY: 1.5 inch ball universal mounting plate for fish finders, GPS chartplotters and more. Compatible with for Arkon, for iBolt, and other 1.5 inch, C size, 38mm arm systems. Rectangular plate with multiple pre drilled holes. 2SUPPORT HOLE DRILLING: The plate is a universal mounting base with multiple mounting hole locations. In some applications, additional holes may need to be drilled to properly mount your electronics. 3PREMIUM MATERIALS: Fish finder mount base is made of durable nylon and silicone materials that can withstand exposure to water and provide long lasting performance. Giving you a stable view during fishfinding that will last a long time. 4HIGH STABILITY: The ball and mounting plate are moulded in one piece, not screwed together, to extend the life and ensure the stability of the unit. The 1.5 inch ball is more reliable and stable in harsh marine environments than the 1 inch ball. 5COMPATIBLE MODELS: Compatible with for GPSMAP 722 722xs , for Striker Plus 5cv 7cv 7sv, for Striker Vivid 5cv 7cv 7sv, for ECHOMAP Plus 72cv 73cv, for ECHOMAP UHD 93sv, for ECHOMAP UHD2 5in 2 7in, etc, for Lowrance HDS Carbon 7, for Hook Reveal 7 9 series, for Elite FS 7 FS 9 and other GPS chartplotters, fish finders.