With the drilling of the glass hollow drill, drill to force uniform and add water to cool, not too strong, easy to cause the drill bit burned (overheating annealing).
Drilling holes in marble can be made of hollow drill holes punched on the glass, while water is being drilled to cool the drill bits.
With the impact of drilling drilling drilling with impact, the impact of a non gear drill to hammer gear, slowly drilling, drilling position should not be too on the marble edge, the method is applicable to the local small aperture;
