Our hex head light section self drilling Tek screws are a hexagon head washered faced self drilling screw. They are suitable for a wide range of uses and are commonly used for fixing cladding, drylining and roofing applications to hot and cold rolled purlins and rails along with general components to steel. They are supplied with a 5/16″ hexagon head and an agressive threadform to ensure connsistent tapping and superb holding power. Manufacturered from carbon steel they are suitable for drilling steel thicknesses from 1.2mm to 4mm