1,Glass grinding head, 2,Glass polishing wheel, 3,Diamond abrasive tools, 4,Steel material 12L14 5,The CNC cell glass Introduction Our ... and good quanlity .Chemical composition:C:0.07%,Mn:1%,P:0.057%,S:0.29%,Pb:0.29% Shank DiameterD6mm ... ---D25mmthickness25mmHardness(p)2p to 30pgritfrom 46# to 3000#colorDifferent kinds :gray ,green ...