do not need a pilot drill hole to penetrate through a surface. As its name suggests, it can cut through or drill its own hole thanks to its drill point feature. This way there is no need for a pilot hole. All you have to do is use a screwdriver
or drill, attach it to the end, screw it in place, and you'll have a precise fitting thread. Self-driving screws are only for soft steel. It is highly recommended to use a larger number of screw points if the metal is thick. For intance, if you have a 13mm steel, it is advisable to use a 5-point self-drilling screw.