... 6.8,8.8,9.8..... DRYWALL SCREW,WOOD SCREW,CHIPBOARD SCREW. A good non-standard fastenerS ... tapping threads "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW" ... . G.W. for a 20 GP container :22.6T-25.5Tadditioal processes Washer assembly,Heat treatment,Baking ... of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America,South America ...