1.Our ball mount utilizes rubber-insert and lockbolts（ Tool-less installation ）to prevent loosening in high vibration for mounting to motorcycle or bike handlebars as well as other round rails within the insturcted dimensions. | 2.This 1 inch ram mount motorcycle fits for handlebars from 0.5" to 1.26" in diameter. | 3.This mount ball made of high quality aluminum alloy.It is durable and reliable in the most demanding environments. The ball joint adopts CNC-molding design, with anti-slip performance. | 4.This 1 inch ball mount handlebar base compatible with RAM Mounts and socket component, including double socket arms, navigation mounts, action camera mounts, bike & motorcycle phone mount holders and others electronic device holders. | 5.The package comes with three rubber ring inserts to provide a snug fit and protection of the mounting surface. Rubber rings diameter are: 0.5'' / 0.87'' / 1''.