... Type "M","UNC","UNF","BSW"threads for Machine threads.Head typesHexagon head,Mushroom head,Pan head ... will actually do strength what you want,testing we can pass.4.Quality equipments and QA ... And Provide dimensions report,chemical report and other testing report . Almost each year ISO Quality person ... in most of places such as drywall,concrete,chipboard,machine,wood...2) Main export market:North America ...