The 3M™ Cubitron™ II Hookit™ Purple+ Premium grinding wheel Multihole 737U contains the world's most modern 3M™ high-performance abrasive grain Cubitron II. The robust triangular grains are electrostatically aligned and, thanks to special properties, sharpen themselves precisely. This not only enables higher removal rates, but also a service life that is up to twice as long as with conventional abrasives used in the industry. With these precision properties combined with the multi-hole perforation for optimal dust extraction, the product is ideal for removing paint, putty and preparing for fine sanding. Our Hookit™ system allows you to quickly switch between different grits. Precision-formed, self-sharpening grits last twice as long as traditional industrial abrasives Sharper cut surfaces