Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB 2)Material: Carbon Steel, ... .5mm~6.3mm,6#~14 Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB2)Material: Carbon Steel,SUS3 ... )Length: 9.5~110mm, 3/8"~4-1/2"5)Thread: AB TYPE,A TYPE6)Head Type:Pan Head,Flat Head ... head,oval head in cross recessed,combined,torx,slottedThread Codefull thread,half thread,or nonstandard