Designed for High Salt Marine Environment - The mount has been Salt Spray Tested for thousands of hours (including stainless steel bolts and springs) to resist high salt water corrosion. Super Sturdy - Constructed of Powder-Coated Marine-Grade Aluminum and Stainless Steel Hardware. Cast in one piece of aluminum rather than screwed together, it remains strong and durable even under the impact of waves. Universal Design - Multi-angle drill base pedestal mounting solution for fish finder, GPS chartplotters and more. The AMPS hole pattern is designed to install directly in a boat, kayak or on any flat surface (Complimentary 4 sets of 316 marine grade stainless steel machine screws, lock nuts and sheet metal screws). Includes a B size 3.5" length 1" double socket arm and a complete flat surface, drill-down mounting solution; The ball and socket technology allows for near-infinite adjustability. Compatible with Garmin GPSMAP 162, GPSMAP 168, GPSMAP 175, GPSMAP 180, GPSMAP 180C, GPSMAP 182, GPSMAP 185, GPSMAP 188, Garmin GPSMAP 232, GPSMAP 238, Striker 5 Series, Striker Plus 5cv. Recommended for fishfinders up to 5 inches, 1.5-inch ballrecommended for more than 5 inches. The mount has been Salt Spray Tested for thousands of hours (including stainless steel bolts and springs) to resist high salt water corrosion. Constructed of Powder-Coated Marine-Grade Aluminum and Stainless Steel Hardware. Cast in one piece of aluminum rather than screwed together, it remains strong and durable even under the impact of waves. The AMPS hole pattern is designed to install directly in a boat, kayak or on any flat surface (Complimentary 4 sets of 316 marine grade stainless steel machine screws, lock nuts and sheet metal screws).