1.engraving technology support for CNC Engraving Machine 2.Longer life-span than electroplated tool 3.faster engraveing speed ... C536660C1449660C8612660C10812860 EM12-121012121260 1. Applicable material : Professional engraving tools for hard materials, such as stone, granite, gravestone , ceramic ... Tools industry. EM12-1210 Diamond Engraving Tool Bit for Carving Stone Marble Granite letter&Relief