This motorcycle mount makes attaching to handlebars, tubing, or railing a breeze Simple to install and easy to use, the possibilities become endless The zinc coated metal u-bolt and nuts included are designed it fit motorcycle handlebars, or circular rail that are 0.50" to 1.25" in diameter Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles High quality materials insure your GPS is safe, secure, and within easy reach. RAM's patented design also dampens shock and vibration helping to extend the life of your mobile device This product can mount to both the brake/clutch reservoir or any round rail that is 0.5" to 1.25" in diameter The holes centers have a minimum width of 0.94" and a maximum of 1.58"