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Self drilling screws turned out to be such a good idea that everybody wanted them. So in addition to the popular hex drive style used so often when assembling air conditioning ductwork, they are also manufactured in a special round washer head style used for attaching metal lath to steel studs. Phillips Recess. #3 Point. Head OD is .413"- .433". Head Thickness is .088" - .098". Made in Taiwan.