Johnny Ray mounts keep your equipment secure and handy. These heavy-duty mounts have a 24-position swivel top and an automatic lock. Patented lever-release mechanism allows you to remove the unit from the base. Made of a molded, highly durable nylon. This two-part swivel mount fits most popular 8" and 10" sonar/GPS units. Base comes fully assembled. Stainless steel springs and screws. Mounting plate size: 10"L x 2"W.