Patent attributes
An improvement in workpiece-engageable devices for accurate workpiece angular formation including a plurality of spirit vials and an engager of a workpiece which establishes an intended bending plane. The plurality of spirit vials includes formation-angle vials adjacent to one another and supported in a respective plane parallel to the intended bending plane and in an orientation corresponding to a respective one of intended angles with respect to a base plane. At least one control vial is supported in a body of the device and aligned in a plane parallel to the base plane. The formation-angle vials may include four formation-angle vials each oriented at one of angles 10°, 22.5°, 30°, 45°, 90° and in some embodiments 60° with respect to the base plane.