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These Screws CAN DRILL STRAIGHT INTO METAL! (Self-Drilling Screws...Fasten Anything To Metal!) - YouTube
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Self drilling screws for fastening to steel. Everything from small wafer head self drillers to screws that will drill and tap up to 1/2" steel.
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structural - Is it safe to screw into a single support beam holding up an entire house? - Home Improvement Stack Exchange
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Wholesale factory customized Self Tapping Screws Into Cast Iron - Wholesale price can be customized screw series – Dashan factory and suppliers | Dashan
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