... processing.3. Cutting, clearing bottom, drilling, 2D, 3D carvingMaterial applied for:Glass, ceramics, silicon slice, crystal, granite, marble, malmstone and ... promptly1. speed limitation: 10000-24000 RPM2. enough water to cool the bits is necessary 3. Carving depth should be 1mm to5mm ... you ordered, please contact us before leaving any negative or neutral feedback.We can work together to resolve any ...