... Diamond Grinding Disc Coating width :16/18/20/25mmCore thickness : 0.6/0.8/1.0mmBore size : 20/15mm Features: 1,Smooth cutting ... ,high cutting speed.2,Coating:nickel,titanium available.3,Ripple cup wheels,for faster romoval and grinding4,They are most efficient ... tools for fast grinding,rough deburring, smooth shaping and finishing of concrete ,stone,and masonry material. If you are ...