Hi- Unfortunately, we do not have that diameter data readily available. But, we can fully guarantee this is a direct fit and compatible with the vehicle application you selected, from 2009 to 2012 Toyota Rav4 base/Sport submodel, all engine sizes fitment. The hole diameter exactly matches the original factory specifications/size/dimension of the selected vehicle application. That is why when you have to look up a direct fit part, you will have to enter the accurate year, make, model, submodel and engine size on the selection.