Positioning firstly when to punch the smooth objects.
When to punch the harder objects, make a hole with a small dril, then expanded with a large one.
Pry a little When to install 2.0 bits.
Note: Wear protective when using tools or emergency situation should be noted.
Please keep the force in perpendicular direction, even forced rotation.
Suitable for wood, plastic, rubber, model and others material to drilling hole.
This is not suitable for agate, jade, metal, steel and other hard materials.