Joysun portable air filer belts are designed with the intention of replacing tedious hand filing and sanding jobs. They are compatible with pneumatic or electric power tools designed for light weld removal, hard to reach area blending, contour sanding and surface preparation on various materials along with a plethora of other uses. The finishing belts are often used for various types of steel, brass, copper, zinc bronze, titanium, cast iron, plastics wood, and painted surfaces.