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.