... on compatible with CNC fast speed and long life finger bit --- diamond toolsfor granite,marble,sandstone and so oncompatible with CNCdiameter20or24mm ... any breakage when cutting the hardness granite Danyang Huachang Diamond Tools Manufacturing CO,LTD was established in 1980s, ... saw blade,Core drill,Brazed saw blade,Profile wheel,Intemational common CNC profile wheel,Finger bits,Silent core milling ...