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