• Material. Heavy-duty vulcanized fiber backing coated with brown aluminum oxide abrasive grain.
• Primary Uses. Designed for aggressive stock removal, weld grinding, deburring, rust removal, and surface blending on metal, wood, and fiberglass.
• Tool Compatibility. Used with right-angle grinders; they require a backing pad and a retaining lock nut mounted onto the grinder's spindle (typically a standard 7/8" or 22mm center arbor hole).
• Size & Grit. Common diameters are 4.5" (115mm), 5" (125mm), and 7" (180mm), with the specific grit number usually stamped on the back side of each individual disc.