A Steel Fiber Powder is a bundle of very fine and flexible sharp-edged steel filaments. The basic use of wool powder is in the automobile industry for asbestos & asbestos free brake liners, brake pads, brake blocks, clutch plates, friction pads and blocks. Steel wool is often used for sanding wood, and it's a great option because it's easier to get steel wool to conform to intricate trim and carving than it is to manipulate sandpaper. The Steel Wool Powder is very efficient.