Arrange your fish finder at the perfect angle on with the hefty Scotty® 2.25" Ball Mount for Large Fish Finders and Chartplotters. Designed for 9"–12" fish finders, this Scotty ball mount has prefabricated holes on top plate for easy installation of gimbal-mount brackets that come with your fish finder. The 3.25" square base securely fastens with 1/4" bolts. The 2.25" ball on this Scotty mount has superior strength and reliable holding power. Constructed using engineering-grade Nylon and stainless steel fasteners to last a lifetime.Manufacturer model #: 173. 2.25" high-grip ball Perfect for 9"–12" fish finders Large, easy-to-handle T-knob 3.25" fixed square mount Corrosion-proof reinforced nylon