Metal Lathe 5 Square Tool Post. This is a heavy duty tool post its well made and that quality feel to it. It has nice touches like an oiler in the locking screw, a acme threaded stud, and a study handle with a satin chrome built in knob. It measures about 5 3/16 across. It will take a 1 1/2 tool. I bought this and thought it came from a Takisawa lathe but I don’t know for sure. I got this with a large steady rest that is listed as well. Feel free to ask question.