DEPRESSED CENTER OR FLAT. VARIETY OF GRIT OPTIONS. T-27, T-29 AVAIL. 7/8″ ARBOR OR 5/8-11″. FOR USE WITH GRINDING ALL TYPES OF MATERIAL. FOR PIPELINE GRINDING, CUTTING, BEVELING, NOTCHING, AND COATING REMOVAL. GENERAL USAGE IS FOR METALWORKING JOBS, DEBURRING, STEEL CLEARING, WELD GRINDING, AND EVEN TOOL SHARPENING. NORMAL SIZES ARE FROM 3″ – 9″.