1, Drilling metal is generally black drill, drill material is generally high speed steel, in general metal materials (alloy steel, non-alloy steel, cast iron, cast steel, non-ferrous metals) drilling, with the use of metalworking drill. However, pay attention to drilling on metal materials, the speed should not be too high, easy to burn the edge of the drill.

Some are now gold-plated with rare hard metal films, made of tools steel and the like, hardened by heat treatment. The tip is ground to an equal Angle and slightly backward to form an acute edge. Drill without heat treatment to harden the steel, iron, aluminum, aluminum easy sticky bit, drilling time need lubrication with soap and water.

2, In the concrete material and stone material drilling, the use of Impact Drill, with stone drill, cutter head material is generally hard alloy. Ordinary household, not cement wall drilling, with ordinary 10mm specifications of the hand electric drill.

3. Drill wood. Drilling on wood materials, with the use of woodworking drill, woodworking drill cutting sales, the hardness of the Tool is not high, the tool material is generally general high-speed steel. There is a small sharp point in the center of the drill tip, and the opposite Angle is relatively large, or even no Angle. For good holding position. The same drill that drills metal can also drill wood. Because wood is easy to heat, brittle chips are not easy to come out, so we must slow down the speed, often exit to remove brittle chips.

4, In the higher hardness of ceramic tile and glass drilling ceramic tile drill, Cutting Tool material using tungsten carbon alloy, because the tool hardness is higher, poor toughness, need to pay attention to the use of low speed and no impact.