Grinding and polishing in one operation. The fiber glass backing allows the disc to fit into corners, without deteriorating the piece of work. The threaded nut results in an easier attachment to the machine, and increased safety and convenience at work. Grinding and sanding on metal: zirconium for hard metals (i.e. stainless steel), aluminium oxide or zirconium for other metals (carbon steel, aluminium…). Cleaning and removal of welding scale, corners and edges. EX Users: shipbuilding, boiler manufacturers, sheet metal shops, automotive, foundries, welding, aluminium fabricators.