Hexagon Fractional Die, National Coarse, 5/16-In. x 18

5/16" x 18, national coarse thread, 1" hexagon fractional die, carbon steel, ideal for routine maintenance, repair work & for rethreading where high accuracy & tolerance thread is not critical, recommended for use with hexagon die stock, die can be used with a wrench or socket when space is limited, designed for hand threading work in a variety of materials.