PCD engraving tools,for granite,marble,glass,ceramic,long service life,fast engraving speed,high work efficiency,customized ... tools,PCD glass engraving tools.Features:1. for granite,marble,glass,ceramic2. long service life3. fast engraving speed 4. high work efficiencyFeatures1 ... The flat bottom knife is used to engrave characters with smooth edges. The size of the engraving characters ranges from 3cm ...