This Capri Tools 200-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: 30 pieces #8 x 1/2-Inch, 30 pieces #8 x 5/8-Inch, 30 pieces #8 x 3/4-Inch, 30 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. Set organized by size/type in a transparent organizer case with snap-close cover for easy storage.