... , Swirl 3. Grit No.: Course, Medium Diamond Cup Wheels are designed for grinding and polishing marble, granite, concrete, porcelin tiles, masonry, ... : 100mm-250mm.2. Application: Diamond double row grinding cup wheels are ideal for form mark removal, deburring, chamfering, smoothing and shaping ... 3. Fast cutting with minimal dust, used dry or wet grinding.4. Type: Single row, Double row, Turbo type, ...