This is the toughest grit impregnated brush we have to offer. Each bristle is 1¾" long, and impregnated with a 46 grit silicon carbide abrasive. We have it and other brushes available in several other sizes in our rotary floor buffer brushes category.
With his particular brush, you must run it in a wet environment because it is so aggressive. Most of the time it is used to strip sealed concrete floors, or scrub unsealed concrete floors. Either way, it is extremely aggressive, and must be used with extreme care. We always recommend testing in an inconspicuous area before hand to make sure the brush will not damage your floor. A break in procedure of you brush may be necessary to help tip the bristles outward and eliminate some of the sharp pieces of grit impregnated into the bristles.