Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB 2)Material: ... Diameter:3.5mm~6.3mm,6#~14 Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB2)Material: ... Type:Pan Head,Flat Head,Hex Head,Bugle Head,Wafer Head,Truss Head7)Point Type:Sharp Point,drilling Point8 ... ,round head,oval head in cross recessed,combined,torx,slottedThread Codefull thread,half thread,or nonstandard