Joysun portable air filer belts have been created 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 file belt is available in a variety of grits that range from heavy-duty 35-50 grit to 60-100 finishing grit and final polishing grit at 120-130.