[Features] The screw is used to tighten the screw itself in a place where the holes are drilled into the other material, eliminating the hassle of twisting work, and since it is not rattle, it is difficult to loose. The holes of the holes may vary depending on the thickness and type of the screw, so please be careful. [Shape] The pitch is roughest and pointed to the tip, and the thread is standing up to the tip. The pointed point of the tip has a guide for positioning the center of the hole and helps to catch the bite. Compatible materials: Mainly suitable for thin plate steel (0.05 inch (1.2 mm) or less) hard boards and wood.