Holders are held on the shank by a pin which locate in slots on either side of the holder allowing about 1-1/2" of travel-any other lathe . Can hold die sizes of 13/16", 1", 1-5/16" & 1-1/2". Die holders can be interchanged very easily. The head slides up and down very smoothly on the shaft. An ejecting pin (* not shown in photographs) will also be included to eject the die easily from the holders )