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High quality hex washer head self drilling screw. This 220-Piece self tapping hex screw assortment is ideal for thicker gauge metal to metal in applications such as air conditioning, ventilation, and heating. Each piece is constructed with zinc plated steel for corrosion resistance. Set includes 8 most-used sizes: 35 pieces #8 x 1/2-Inch 35 pieces #8 x 5/8-Inch 35 pieces #8 x 3/4-Inch 35 pieces #8 x 1-Inch 20 pieces #10 x 1/2-Inch 20 pieces #10 x 5/8-Inch 20 pieces #10 x 3/4-Inch 20 pieces #10 x 1-Inch Total: 220 pieces Set organized by size/type in a transparent organizer case with snap-close cover for easy storage.