This product, the 10PCS 2/3 Inch 40/60/80/120 Grit Roll Lock Flap Disc Grinding Sanding Wheel, is a versatile tool for metalworking and other surfaces. With its 40/60/80/120 grit assorted pack, it can fulfill all your polishing needs from coarse to fine. Made from zirconia alumina, it offers a superior cut rate and longer service life than aluminum oxide. The safety torque spiral design adds flexibility and durability, while the overlapping abrasive strips provide cooler and more efficient grinding. Ideal for a wide range of applications, including grinding, blending, and finishing, this flap disc is compatible with various air and electric tools. With its high performance and extended service life, it is a cost-effective option for your sanding needs.