The apparatus used to drill holes in hard surfaces such as marble, granite, porcelain, travertine and concrete is called diamond hole saw.
 
Carbide coated diamond hole saw that are hard enough to drill holes in many hard surfaces are HRC48/93 K10 standards. We can two type as wet cut diamond hole saws and dry cut diamond hole saws. The important thing here is that the customer purchases a diamond core bit with the correct geometric shape. You can drill holes in all types of natural stone, asphalt, fiberglass and glass with carbide brazed diamond core bits.
 
When you ask about a product, please write what the product is to be drilled, the diameter of the hole you want to drill, the final hole shape (straight, conical, countersunk) and the amount of diamond core bits you want to buy.