Product information: FEWELL 4.5inch concrete double row grinding wheel suitable for angle grinders;with 18 diamond segment teeth, 8 cooling holes, and a 7/8 inch arbor hole, diamond segment thickness is 5 mm,arbor:7/8"-5/8" (22.23 mm-15.88 mm)with reducer washer Double row and air holes design: 4.5 inch diamond grinding wheel disc grinder cup design of the double-row segment of the diamond grinding wheel ensures the grinding with high precision and good results;8 holes have strong heat cooling and better chip remove Application: Diamond double row grinding wheels perform well in grinding concrete, cement, masonry stone, tile glue, marble and granite;the grinding wheel can also be used for the removal of glues and epoxies Long-term working life: High-concentration diamonds increase the use time of the product;heat treatment better combines the segment with the steel body, providing efficient use Wet or dry use：Concrete grinder wheel 4 1/2 for wet or dry surfaces FEWELL 4.5inch concrete double row grinding wheel suitable for angle grinders.With 18 diamond segment teeth, 8 cooling holes, and a 7/8 inch arbor hole, diamond segment thickness is 5mm.