No core grinding wheel 1.Long working life 2.fine work results 3.quick delivery time 4.sound after-sell service No core grinding wheel1.Long working life2.fine work results3.quick delivery time4.sound after-sell service diamond and cbn grinding wheels used to grind high speed steels, tool & die steels, alloy steels, Aerospace alloys and hard stainless steels We have the 1A1,12A2,6A2,11A2,11B2, ...