The Arbortech Contour Sander is a revolutionary compact attachment tool for sanding deep profiles, contours and detailed wood work. Simply attach the sander to any standard 4" or 4-1/2" angle grinder and go. The random orbital sanding action combined with the patented flexible backing pad creates a perfect finish without scars, scratches or blemishes. Contour Sander attachment comes complete with tools, backing pad and 3 packs of sanding discs (grits 80, 120, 240, 320, 400, 600).