out of the hole saw before the cutting can continue. Diamond drilling Diamond hole saws are also called diamond core drill bits. Laser welded diamond core drill bits can be used in wet and dry drilling, but not all materials to be drilled are suitable for dry drilling. Very hard materials like reinforced concrete normally should be drilled with water, otherwise the excessive heat generated during the drilling process may cause the diamonds on the core bit to become blunt, and then lead to poor drilling performance. The bond materials welded diamond core drill bits usually are specially adjusted to fit the wet and dry drillings respectively. This can make the core bits perform better in drilling speed and/or lifespan. Diamond hole saws will drill through tile, porcelain tiles, granite, marble, concrete, metals and any lapidary material. References Hole making Metalworking cutting tools Saws