This extended length plastic mount allows you to take full advantage of all the data that your Edge givesThe Edge is out in front of you for easier, heads up positioning and increased safetyFits 31.8 mm barsCompatible most imprtantly with Edge 1000 but also with Edge 810, 800, 510, 500, 200, plus Forerunner 310XT, 910XT with the quick release kitWeighs just 30 gMade from impact resistant plasticPlease note for the mount to work with the Forerunner 910XT or 310XT you must remove the screws from the bottom, rotate the inner-mount and reinsert the screws, and your watch will mount in the proper orientation on the handlebar