This item features: -Closed coat aluminum oxide with a vulcanized fiber backing for maximum performance. -Open coat design does not load when grinding/finishing. -This creates extra spacing to allow Zirconia to break down without excess heat. -Abrasive Material: Aluminum Oxide. -Used With: Right Angle Grinder/Sander. -Quantity: 25 per carton. Model Code Model Description AADia.:4 1/2 in Arbor Diam:7/8 in Grit:100 Speed:15300 rpm Applications:Blending Removing Applicable Materials:Fiberglass Ferrous Metals Body Fillers Paint Plastics ABDia.:4 1/2 in Arbor Diam:7/8 in Grit:120 Speed:15300 rpm Applications:Blending Removing Applicable Materials:Fiberglass Ferrous Metals Body Fillers Paint Plastics ACDia.:4 1/2 in Arbor Diam:7/8 in Grit:16 Speed:13300 rpm Applications:Removing Blending Applicable Materials:Ferrous Metals Body Fillers Paint Plastics Fiberglass ADDia.:4 1/2 in Arbor Diam:7/8 in Grit:24 Speed:15300 rpm Applications:Blending Remov