5X.75 High Speed Steel, Round Adjustable, Special Metric Thread Die, 13/16" O.D. A High Speed Steel Round Adjustable Die is designed to cut new threads. Round dies are chamfered on both faces. one side has a 2 to 3 thread taper for starting new threads, while the other side has a 1 to 1-1/2 thread chamfer for threading close to a shoulder. Adjustment is obtained by a fine pitch screw which forces the sides of the die apart, or allows them to spring together. The slot is beveled so that when the dies are used in a machine holder the adjusting screw can be removed and adjustment made by the adjusting screws in the holder.