Description: U-Bolt Base For Motorcycle Bike Handlebar Mount Fits handlebars 11mm to 27mm in DIAMETER. Reducer included. Mounting Ball size 1" This u-bolt base contains a 1" rubber ball The zinc coated metal u-bolts accommodate rails from 0.43 to 1.06" in diameter The base also includes black cover caps to be placed over the exposed ends of the u-bolt as well as a shim to cope with 0.43" diameters Specification: Mounting Type: Handlebar Material: Powder Coated Marine Grade Aluminium Ball Size: 1" (25mm)Rubber Ball U-Bolt: Accommodates rails from 0.43"(11mm) to 1.06" (27mm)in diameter Zinc coated steel (not rust proof) Package Includes: 1 Set Motorcycle Bike Handlebar Mount Note: 1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 3. Instruction is not included. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand,Thank you