1,technology support for using bits by cnc engraving machine 2,it is good for engraving 3D finishing Specification: Model Shk( ... electroplated diamond toolGood For1. stone monument, tombstone, and so on... carving work.2. Art glass, emerald, glass decoration ... 3. Cutting, clearing bottom, drilling, 2D, 3D carvingMaterial applied for:Glass, ceramics, silicon slice, crystal, granite, marble, malmstone ...