Amzer Bicycle Handlebar Mount for HTC Thunderbolt ADR6400  - Black The swiveling head rotates the custom fit cradle and your HTC ThunderBolt ADR6400 to the perfect viewing position. Your HTC ThunderBolt ADR6400 is now easily transferable from one Bicycle to another Bicycle. Suitable for handlebars between 0.75 inches to 1 inch in diameter. Swivel ball joint with locking ring - enables the holder to be positioned and locked in place. This mount allows movement left, right, or rotates 360 degree.