Norton 5" Medium Rapid Prep AO Disc 25pk - N662610550225" Medium Rapid Prep Surface Conditioning Hook & Loop Disc 66261055022 Perfectly prepare, blend, clean and detail your metal projects with the Bear Tex Rapid Prep AO medium grit non woven hook & loop disc. The disc works with stainless steels; tool steels; welds; aluminum; fiberglass; composites; carbon steels; super alloys; titanium; and cast, gray and ductile iron. With a long life, the aluminum oxide abrasive grain coating gives better performance