... ,technology support for using bits by cnc engraving machine 2,it is good for engraving 3D finishing Specification: Model Shk ... 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, granite, ...