ATD Tools 277 117-Piece Machine Screw/Fractional/Metric Tap Die Drill Bit Set Hexagon dies allow a socket or wrench to be used in areas with limited space Molded storage case included (6) Machine screw plug taps and 5/8 inch hex dies (10) fractional plug taps and 1 inch hex dies (6) metric plug taps and 5/8 inch hex dies (10) metric plug taps and 1 inch hex dies (2) pipe thread plug taps and 1 inch hex dies