With over 70 years of product testing under our belt, Scotty Saltwater products are engineered to endure a lifetime on the sea. So you can get out and fish season after season. With what weve been demanding of our products for decades, its no wonder Scotty Freshwater products are chosen by anglers whod rather be on the water, than at the shop.• 2.25 Inch Ball Mount With Fish Finder Top Plate Square Base Securely Fastens With 1/4 Inch Bolts 2.25 Inch Ball Design Has Superior Strength & Reliable Holding Power Constructed Using Engineering Grade Nylon & Stainless Steel Fasteners To Last A Lifetime | Scotty Accessory Mount, Compatible With 10 To 12 inch Fish Finder