Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB ... :3.5mm~6.3mm,6#~14 Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB2) ... Head,Wafer Head,Truss Head7)Point Type:Sharp Point,drilling Point8)Drive Type:Phillips,Pozi,Combination9)Finish: Plain, Zinc ... truss head,hexagon head,round head,oval head in cross recessed,combined,torx,slottedThread Codefull thread,half thread,or ...