Middle bits don't cut well eventually grain of Wooden. The central screw has a tendency to pull out, or to split the wood together the grain, plus the radial edges have problems reducing from the prolonged Wooden fibers. Greatest for: Drilling angled holes for screws A specialty bit, a pocket https://drillbitsupplier47159.alltdesign.com/getting-my-drill-bit-manufacturer-to-work-53449964