DRYWALL SCREW,WOOD SCREW 1.ISO,ANSI,JIS,DIN,BS& non-standard fastener supply 2.ROHS is capable 3.Grade ... :4.8 ,6.8,8.8,9.8..... DRYWALL SCREW,WOOD ... tapping threads "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW"threads ... of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America,South America ...