1. To drive a self tapping screw into a wall, you can use an electric hammer, a screwdriver, or a gun drill. If you want to drive it into a concrete structure, you need to use an electric hammer to meet the strength standards. If the strength of the concrete reaches C10 or above, ordinary nails cannot be used, otherwise the load-bearing capacity is insufficient. It is best to choose cement steel nails. For those with high load-bearing capacity requirements, it is best to use expansion screws, combined with self tapping screw models for fixation, to ensure that there is no problem of falling.
2. When using self tapping screws, first we need to drive the screws into the holes on the wall or floor, and then use a wrench to tighten the nuts on the self tapping screws. The screws will move outward, but the metal knife on the outside cannot reach them. Next, the large head at the bottom of the screw will drill the metal knife open, occupying the entire hole, so that the self tapping screw is very stable and cannot be pulled out.