... by cnc engraving machine 2,it is good for engraving 3D finishing Specification: Model Shk(mm)Ced(mm)degreeOvl(mm)Ball ... Strong, durable, longer life than electroplated diamond toolGood For1. stone monument, tombstone, and so on... carving work.2. Art ... .3. Cutting, clearing bottom, drilling, 2D, 3D carvingMaterial applied for:Glass, ceramics, silicon slice, crystal, granite, marble, malmstone and ...