CENTURY DRILL & TOOL 7/16-14 National Coarse Tap & 3/8" Fractional Drill Bit Set includes a precision cut 7/16-14 national coarse tap and a 3/8" fractional drill bit. The tap is heat treated and tempered for file hard threads and longer, useful life. It is designed for hand cutting applications and offers consistent, exact threading. The drill bit is made of premium grade high speed steel for general drilling in wood, metal, and plastic. This combo pack provides the correct drill size for the tap in one convenient package.