Bargain Bulk Price for High Quality Drill Bits – size 3/16”The manufacturer must have high Quality Control inspection standards because each of these 12 drill bits was flawless. Each drill bit was perfectly sharpened and produced two identical spirals when drilling. Because these drill bits are perfect, I suppose a machine produces them however, the workers can be rightfully proud of their superior craftsmanship in setting up those machines, keeping the machines accurate, and choosing the correct metal alloy.