Big Gauge Self-drilling ScrewsDia. 8.0 Spiral Point #8.
When fixing metal sheets, roof sheets, corrugated boards, or even sandwich panels onto a 20 mm thick H-beam, usually a screw of M5.5 or M6.3 in size will be sufficient. What if you need to fix heavy structures like advertisement boards, machines or equipment to studs? This big gauge will provide extra security.
Sun Through is the few manufacturers in the world who can produce M8.0 self-drilling screws which drills a 20mm steel.