Durable and Rust-proof: This fish finder bracket is made of high temperature die-cast aluminum alloy with an integral die-casting and a rust-proof powder coating on the surface to cope with high salinity environments. Suitable for use in marine scenes such as fishing boats and ships. Dual Arm Extension: The long dual socket arm has an overall length of 22cm(8.7") and is adjustable for angle and height with four rotation joints. Combine the long and short mount arms for optimal viewing angle. T-Bolt Attachment: The set comes with a 1" ball T-Bolt attachment for fish finder mounting or mounting the mount on a boat rail for monitor mount purposes Multiple Combinations: The fish finder bracket set includes: long aluminum arm x1, short aluminum arm x1, aluminum rould base x2, 1" ball adapter with 1/4"-20 x25" thread x1, aluminum 25mm ball to ball x1, track ball with T-bolt x1. It can be freely combined into fish finder brackets, monitor brackets and other forms Wide Application: Compatible with RAM Mounts B size components. Ideal for installing fish finders, GPS chartplotters, depth finders, industrial computers, navigation and monitors, etc. KALCINTY Ball Mount 1INCH for Fish Finder Camera Monitor