• Air-powered 2-machine unit is an "over-under" aid for simultaneous removal of scale from top and bottom of girder web plates prior to welding.
• Top unit detaches easily to permit portable "touch-up" descaling.
• Both top and bottom unit use 1 in. (25mm) wide Roto Peen bonded shot flap assemblies to mechanically fracture scale and old coatings with negligible removal of the base metal.