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Are sheet metal screws required for connecting round duct branches? - Home Improvement Stack Exchange
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Teks #10 x 1-in Socket Hex-Drive Sheet Metal Screws (140-Count) in the Specialty Screws department at Lowes.com
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Everbilt #8 x 1/2 in. External Hex Flange Hex-Head Self-Piercing Screw 1 lb.-Box (320-Piece) 116098 - The Home Depot
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