RAM Part RAM-B-149Z-UN7 : Heavy duty metal mount coupled with RAM's X-Grip cradle.  These fit handlebars up to 1.25 inch diameter.  This includes the RAM-B-231ZU base, metal arm and RAM-HOL-UN7BU X-Grip Cradle.

Holder Dimensions:
Minimum Width = 0.875"
(Devices at 0.875" must be a minimum of 4" in height to fit into holder)
Maximum Width = 3.25"
Depth = 0.875"