... bits by cnc engraving machine 2,it is good for engraving 3D finishing Specification: Model Shk(mm)Ced ... diamond toolGood For1. stone monument, tombstone, and so on... carving work.2. Art glass, emerald, glass decoration processing.3. Cutting, ... clearing bottom, drilling, 2D, 3D carvingMaterial applied for:Glass, ceramics, silicon slice, crystal, ...