Roofing screw is suitable for the roof construction .No matter the roof's material are iron steel or wood ,roofing screws can drill and tighten immediately .At the same time ,we can use this kind self tapping screws when the iron sheet's thickness is less than 1MM ,otherwise we can use the self-drilling screws over 1mm.

Material :carbon steel and stainless steel ,brass

Size:4#--14#(2.9mm---6.3mm)

Length:4mm--500mm

Standards:GB,ANSI,DIN,ISO,IFI,JIS and what you request