The PowerDrive Drill/Driver Threaded Bit Adapter from Milton Industries, is a 1/4" adapter designed to access tight spaces such as engines, under the hood, or other hard-to-reach areas. The adapter features a 1/8" cobalt drill bit to ensure accurately sized holes and tolerances for working on high strength steel, titanium, and aluminum. The adapter is made in the U.S., steel heat treated, and black-oxide coated for corrosion resistance.