The RAM marine grade aluminum mount with zinc coated U-Bolt rail adaptor base includes a 1” diameter ball and socket system with RAM plastic cradle for the Garmin Astro 220, GPS 60, GPSMAP 60, 60C, 60CS, 60CX, 60CSx. The rail adaptor base will fit circular rails from .75″ to 1″ in diameter. [...]

These fit handlebars to one inch and fits the round mounting attachment on the back of your GPS. These include a rubber strip for smaller handlebars too.
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