Product Description The DEWALT Black & Gold Metal Drill Bit Sets feature a black and gold coating for preventing rust. The tapered web design provides extreme durability to resist breakage. The DEWALT drill bits sets feature a 3-flats shank to reduce spin-out in the chuck. The Black & Gold metal drill bits are made of heavy-duty High Speed Steel for drilling into a variety of materials including plastic, wood, and metal. Each bit features a 135 degree split point tip design to help reduce walking. From the Manufacturer The DEWALT DW1177 20-piece drill bit set contains bits sized from 1/16-inch up to 1/2-inch. These bits have a black oxide finish for greater wear protection and longevity of the bit. The parabolic flute design also gives these bits greater strength. They have a 135-degree split-point design that reduces slip and walking and allows for easier no-slip starting. The bit set includes a sturdy tough case container to keep bits organized. Tough cases include a sliding soft-grip lock that keeps the case closed securely to prevent lost bits. These bits are ideal for drilling in metal, wood, and plastics.