The Johnny Ray JR-400 Marine 1.25"x 2.875" Top Push-Button release Portable Sonar Swivel Mount is designed to make permanent mounts portable. This mount is compatible with "most" sonar and viewing devices and is easy to attach. The swivel design allows for diverse viewing angles during use. The molded Dupont nylon construction is strong and durable. Compatible with MOST Sonar & Viewing devices Swivel Design for Diverse Viewing Angles Molded DuPont nylon construction is strong & durable .