... 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 ... #4)Length: 9.5~110mm, 3/8"~4-1/2"5)Thread: AB TYPE,A TYPE6)Head Type:Pan Head,Flat Head,Hex Head,Bugle Head,Wafer Head,Truss Head7)Point Type ...