Amzer Bicycle Handlebar Mount for iPhone 4 The swiveling head rotates the custom fit cradle and your Apple iPhone 4 to the perfect viewing position. Your Apple iPhone 4 is now easily transferable from one Bicycle to another Bicycle. Suitable for handlebars between 0.75 inches to 1 inch in diameter. This mount allows movement left, right, or rotates 360 degree. Swivel ball joint with locking ring - enables the holder to be positioned and locked in place.