The Contour Sander™ is a revolutionary attachment for detail sanding deep profiles and countours in woodworking projects, making it the perfect alternative to sanding by hand. Equipped with a flexible backing pad to mold to the shape of your project, this random orbital sander easily attaches to the Power Carving Unit™ or any standard 4" (100mm) or 4 1/2" (115mm) angle grinder with a 5/8" spindle.