Norton 87795 Rubbing Brick 8" x 3-1/2" x 1-1/2"Highlights: 8" x 3 1 2" x 1 1 2" Fluted Crystolon Extra Coarse For removing mold and form marks, cleaning castings and rubbing down concrete Contoured handle for extra comfort and working overhead High quality silicon carbide rub bricks Securely attached comfortable handle Shaped like a building brick , plain rubbing bricks are ideal for dressing Grinding wheels and for cleaning and scouring metal and alloy castings