Steel fibers, in different degrees of coarseness, which are formed into a pad that resembles wool fibers. Steel wood can be used for such diverse applications as cleaning metal or smoothing wood.

Steel wool is a bundle of strands of very fine soft steel filaments, used in finishing and repair work to polish wood or metal objects, and for household cleaning. It is manufactured by drawing ”steel wool wire”, made from low carbon steel (low enough to be close to plain iron).