... , Turbo, Swirl 3. Grit No.: Course, Medium Diamond Cup Wheels are designed for grinding and polishing marble, granite, concrete, porcelin tiles, masonry ... for form mark removal, deburring, chamfering, smoothing and shaping of marble, granite, concrete, porcelin tiles, masonry, natural & artificial stone surfaces.3 ... . Spec.: Outer Diameter From 105mm to 250mm6. Grit No.: Course, Medium, Fine