RAM Zinc Coated U-Bolt Base with 1" BallThe RAM motorcycle handlebar base contains a 1" rubber ball designed to sit at right angles to the mounting rail. The zinc coated metal u-bolt acmodates rails in diameter from 0.5" to 1.25" in diameter. The base also includes black cover caps to be placed over the exposed ends of the u-bolt. U-Bolt Dimensions:Acmodates rails from 0.5" to 1.25" in diameter. Material: Powder Coated Marine Grade Aluminum Ball Size: 1" Rubber Ball "B" Size Product : RAM MOUNT ZINC COATED U-BOLT BASE W/ 1" BALL Manufacturer : RAM MOUNT Manufacturer Part No : RAM-B-231ZU UPC : 793442123115