Ram Mount Handlebar Rail Mount with Zinc Coated U-Bolt Base for the Garmin StreetPilot c310, c320, c330 and c340 Simple to install and easy to use, the possibilities become endless Designed to fit motorcycle handlebars, or circular rail that are 0.50" to 1.25" in diameter High quality materials insure your GPS is safe, secure, and within easy reach This mount is designed to hold the following devices: Garmin Street Pilot c310/c320/c330/c340 Powder Coated Marine Grade Aluminum Patented universal rubber ball and socket system allows you to mount virtually anything anywhere. Made of marine grade aluminum with a powder coated finish and rubber balls Superior shock and vibration isolation for electronics Unique design provides easy installation, mobility, strength, adjustability and versatility Construction provides a light weight and corrosion resistant product