This is a screw with a cross hole and has a cutting edge. Even if the opposite part is steel, there is no need for a bottom hole. [Features] The head tapping screw with cross holes has a cutting edge. Drill a hole with the cutting blade, and you can use a drill screw to tighten continuously. The head is not removed, but counterbored processing is required. [How to use] (1) Even if the others material is steel, there is no need for a bottom hole. (2) Can be tightened directly while positioning at the site. (3) Select the model number and size according to the thickness of the others steel plate. Images are for illustrative purposes only.