... 200mm .Threads/ Scrows Most scrows are available.such as :Self tapping threads "A","AB", Threads for chipboard screw,wood screw,drywall ... screw;Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head,Countersunk head ... used in most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America,South America, ...