... .8,8.8,9.8..... DRYWALL SCREW,WOOD SCREW,CHIPBOARD SCREW. A good non-standard fastenerS ... threads "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW ... ,anodized ,Parkerising,and Environmental Plated is used in our products,Hexavalent chromium are accord with ROHS ... scope:They are used in most of places such as drywall,concrete,chipboard,machine,wood...2) Main export ...