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Norton 4-1/2'' 40 Grit Flap Disc. For surface blending and moderate removal of wood, metal, light paint, varnish or rust. Grinding and finishing with the same wheel. No switching from a depressed center wheel to fibre disc. Zirconia alumina abrasive cloth, lasts 20X longer than fibre discs. High rate of stock removal. Angled flaps, Built-in angle for grinding. More abrasive makes contact with the work surface. Phenolic resin backing plate. Lightweight. Will not smear the workpiece. Wears uniformly with flaps. Stacking of abrasive flaps, more comfortable to grind with.