Threading kit for lathe machine available in morse taper MT4 shank Made of Tool steel. Shank is precisely ground. Interchangeable die holder in metric sizes- 13/16", 1", 1-5/16" & 2" Inch The morse taper goes inside the tailstock taper & the body of the holder having threading die floats on the parallel part of the shaft while threading the round bar on the lathe machine. Holder is hold on the shank through a guiding pin locates in the slots on the either side holder, allowing approx travel or float of 1.5" for threading on the round workpiece