Variety Pack Box of 78 Dura-Gold Premium 3" Diameter 36, 60, and 80 Grit Surface Prep Grinding Discs with Backing Pad. The pack includes 25 each of 36, 60, and 80 grit surface prep grinding discs and a quick-change disc adapter holder with both a round and a hex 1/4" drill shanks.Premium quality high-performance 3" surface prep grinding discs with male R-Type quick change roll lock connection that attaches to the included disc adapter holder.Superior quality surface prep grinding discs made with super-coated aluminum oxide corundum fused with zirconia alumina. It delivers a fast, exceptionally long-lasting sharp cut with a consistent scratch pattern. It has maximum resistance to clogging and loading, increasing your productivity and reducing material consumption.These surface prep grinding discs are ideal for sanding on all types of surfaces. Use them for medium to aggressive sanding and grinding on automotive paint, primers, body fillers, and putties before painting or for removing scratches on wood and paint.Our surface prep grinding discs are suitable for use in auto body and paint shops, woodworking, wood furniture making, metalworking, metal sanding, crafting, household, drywall, industrial, fiberglass, plastics, or any other surface that needs sanding.