The PFERD 4-Sided Sanding Sponge is designed for aggressive manual sanding applications across wood, paint, metal, and drywall surfaces. Measuring 2-3/4" x 4" and featuring medium 100 grit aluminum oxide abrasive on all four sides, this sanding block delivers extended usability and consistent cutting performance. Its durable construction provides excellent grain adhesion and high edge stability, allowing for reliable sanding on flat surfaces, edges, and corners without premature wear or deformation. The coarse grit is ideal for demanding tasks such as paint stripping, derusting, deburring, chamfering, removing oxide layers, roughening surfaces, and step-by-step fine grinding. The flexible sponge structure conforms to contours and irregular shapes while maintaining control and surface contact. Designed for manual application, it is suitable for a wide range of materials including steel, stainless steel (INOX), aluminum, cast iron, brass, copper, hardwood, softwood, thermoplastics, tiles, concrete, reinforced concrete, titanium alloys, and more. For durable, aggressive hand sanding performance in professional or jobsite environments, choose PFERD sanding solutions.