... 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 ... )Finish: Plain, Zinc, Black Phosphated, Grey Phosphated,Nickel,Cooper,Dacroment,Ruspert DiameterST2.9-ST6.3 #4-#14Length6.5mm-130mm 1/4"-5"StandardDIN,ANSIM,ISO ...