DIN7504K Hexagon Head Self Drilling Screw factory
·Steel is often used in applications where strength is the primary consideration
·Zinc plating resists corrosion and has a reflective appearance
·The hex washer head has a serrated flange for additional grip on the mating surface that resists loosening
·Hex drive tightens from the side with a wrench, enabling use when there is no space above for a driver