Replacement Rub Brick - 20 GritThis fluted silicon carbide rub brick makes dressing down concrete fast and easy. Use this brick to smooth concrete and remove form marks for a smooth modern look. The fluted brick is on a diagonal, which provides sharp edges to help with stubborn materials while carrying away the excess debris. A popular tool to create a smooth professional finish on block walls, wet tile, and concrete, especially excess cement from forms. The favorite tool for