... ,6.8,8.8,9.8..... DRYWALL SCREW,WOOD SCREW,CHIPBOARD SCREW. A good non-standard fastenerS manufacturer for ... tapping threads "A","AB", Threads for chipboard screw,wood screw,drywall screw;Type "M","UNC","UNF","BSW"threads for Machine ... type,hexagonal type,Torx type,trangle type,slotted point type,square type,Combined type...FinishZinc plated,Nickel ... any query ! Drywall Wood Chipboard Sharp Point Screw