The special flap arrangement ensures consistent abrasive wear and continuous exposure of new grit while maintaining high cutting performance and consistent finishing quality throughout the entire life of the tool. Being extremely flexible, these wheels can perfectly adapt to irregular shapes. Excessive overheating of work surfaces is avoided with the aid of constant ventilation. Compact design and low weight make flap wheels extremely easy to handle. The low noise levels of shaft-mounted flap wheels are a further comfort for end users. Recommended applications include finishing, light deburring, cleaning or preparation for subsequent treatments (chromium plating, nickel plating or painting) on small or hard-to-reach surfaces such as the internal surfaces of pipes, cylinders, moulds, parts of irregular shape.