Flap wheels are designed to grind and finish hard-to-access areas such as the inside of pipes or tubes. They are made of multiple abrasive sheets attached to a core for fabricating, deburring, cleaning, polishing, and finishing jobs in metalworking applications. A flap wheel is one of the most useful tools to have in metal fabrication. Coated abrasives flap wheels are used for most applications from grinding to polishing. This flap wheel is commonly used on ferrous alloy, high tensile materials, and finish complex shapes and tight contours on a workpiece. The wheel's flexibility allows the wheels to access hard-to-reach areas. A flap wheel can attach to grinders, drills, impact wrenches, or handheld rotary tools.