The settings on the dial adjust the Pro’s safety bar to expose more or less of the blade. 1 is the most sensitive setting. 6 is the most aggressive. But there’s 28 settings in between one and 6. You’ve got options. Your perfect shave is waiting.   The Pro dial lets you adjust the amount of blade exposure micrometers at a time (hence, “micro-settings”). You get to choose how sensitive or aggressive you want your shave to be by setting your blade exactly where you want it to be.