... Hex Head Self Drilling Roofing Screws 1)Standard: DIN, ASTM,AS,GB 2)Material: Carbon Steel,SUS 3)Diameter:3.5mm~6.3mm,6#~14 Hex Head Self Drilling ... Roofing Screws 1)Standard: DIN, ASTM,AS,GB2)Material: Carbon ... TYPE,A TYPE6)Head Type:Pan Head,Flat Head,Hex Head,Bugle Head,Wafer Head,Truss Head7)Point Type:Sharp Point,drilling Point8)Drive Type: ...