Made from high quality materials to insure your device is held safe, secure, and within easy reach. RAM's patented design also dampens shock and vibration helping to extend the life of your mobile device. Included in this package is hardware that accommodates rails from 0.5" to 1.25"Â diameter. If your handlebars are 1", larger than 1", tapered, fatties, 28mm tapering down to 25mm, this is the mount to use. Use the u-bolt bracket on the bars, which is included in the mount kit on this page: The cast bracket accepts 1" and 1.25" u-bolts and both are supplied in the kit. Also included is a black plastic shim that sits inside the u-bolt for attaching to rail above 1/2" diameter. If you wish to purchase the u-bolt base mount separately the part number is RAM-B-231Z.