A bevelled edge refers to an edge of a structure that is not perpendicular to the faces of the piece. The words bevel and chamfer often overlap in usage and are often interchanged, while in technical usage they may sometimes be differentiated. A chamfer is typically used to soften the edge of a piece for the sake of safety, wear resistance, or aesthetics and usually runs at degrees. A bevel generally runs from the front face all the way to the back face and can be extremely shallow or close to 90 degrees, at 90 degrees the timber is considered square edged.