Grinding wheel are mainly used for grinding all kinds of stone, concrete, etc. Item Number Outer Diameter(D) Segment Dimension (T*H) Segment Number Inch Metric(mm) SE0176 4" 100 7*5 14 SE0177 " 115 7*5 16 SE0178 5" 125 7*5 18 SE0179 6" 150 7*5 20 SE0180 7" 180 7*5 24