1.engraving technology support for CNC Engraving Machine 2.Longer life-span than electroplated tool ... , it can engrave more than 5000pcs. if you don't how to use it , please contact me . I can operate cnc engraving machine ... (mm)AngleOvl(mm)E16864540E26567040E36369040 1. Applicable material : Professional engraving tools for hard materials, such as stone, granite, gravestone , ceramic tiles, glass ...