Power tools are provided. A power tool can include a drop wheel moveable in a vertical direction about a pivot axis; a spring rotatably biasing the drop wheel about the pivot axis; a stop mechanism defining a plurality of stop positions each corresponding with a different relative position of the drop wheel; and a user interface configured to selectively disengage the stop mechanism to permit the drop wheel to rotate about the pivot axis until the stop wheel contacts an underlying surface below the power tool, wherein the user interface is disposed at a handle of the power tool.