How many types of drills?

The main types of electric drills are hand electric drills, impact drills and hammer drills (electric hammers). The following is a detailed introduction:

Hand drill. The power is small, mainly used for drilling wood and as an electric screwdriver. Some electric hand drills can be changed into special tools according to their uses, with many uses and models.
Percussion drill. Rely on rotation and impact to work, mainly suitable for concrete floors, walls, bricks, stone, wood and multi-layer materials impact drilling, but also in wood, metal, ceramics and plastic drilling and tapping.
Hammer drill (electric hammer). Can be drilled on a variety of hard materials, the use of a wide range.