2.This 1 Inch Ball Mount 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. Suitable For Bike, Bicycle, Motorcycle, Stroller, Mountain Bike, Dirt Bike, Road Bike, Golf Cart, Electric Scooter, Atv, Etc. 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''. Water Resistance Level : Waterproof