Truss/Button Head Machine Screw with Zinc Plating and Length Ranging from 13 to 300mm Head type: CSK/flat head, truss head, trumpet head, wafer head, pan framing ... head, pan wafer head, hexagon head, pan headThread type: type A, B, C, high-low, double ... report, and we also pass the BV inspection Truss/Button Head Machine Screw