?PACKAGE CONTAINED?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''. ?UNIVERSAL COMPATIBILITY?Sptchapn 1 inch ball mount handlebar base compatible with RAM Mounts and socket arm B aize component, including double socket arms, navigation mounts, action camera mounts, bike & motorcycle ATV phone mount holders and others electronic device holders. Suitable for bike, bicycle, motorcycle, stroller, mountain bike, dirt bike, road bike, golf cart, electric scooter, ATV, etc. ?HIGH QUALITY RAW MATERIAL?This 1" ball head mount ball head base is 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. ?LARGE CAPACITY FOR HANDLEBAR?This 1 inch ball mount fits for handlebars from 0.5" to 1.26" in diameter. ?STURDY AND SHOCKPROOF?Sptchapn ball mount base utilizes rubber-insert to prevent loosening in high vibration for mounting to motorcycle ATV or bike handlebars as well as other round rails within the insturcted dimensions.