Total 31 Pcs Grit type: 40 grit / 60 grit / 80 grit. Each grain 10 Pcs. Suitable for electric drill, grinder and other rotary tools. Torque spiral design can provide high flexibility and long service life. Overlapping sanding belts can provide a cooler and more efficient grinding process. Flap Disc: Durable, heat-resistant, moisture-resistant, anti-static and anti-clogging, designed for the high speed sanding and heavy load removal. Ideal for grinding, stock removal, chamfering, blending welds, deburring, rust removal, cleaning and finishing on stainless steel, aluminum, concrete and many other surfaces. Package Includes: 31Pcs Assorted Flap Discs. Assorted pack of 40/60/80 grits to meet your polishing needs from coarse to finest.