PFERD Combidisc ceramic oxide quick change abrasive disc is for use on alloyed and unalloyed steels, cast iron, and hard metal coatings. Aggressive grinding action results in unsurpassed stock removal rates. Active additive fillers in the coating provide substantially improved abrasive performance while preventing loading and heat build-up. Specification: Diameter (D1) (Inches): 2; Grit: 36; Type CDR.