The external dimensions are 400 mm in length and 90 mm for the diameter of the head.
Internally it is registered it accepts that the ball joints 35 to 45 mm and it is 1 mm. However, I have tried putting a 34mm outer sleeve and I managed to block it in 3-jaw head ... and I did not get to rip the machine.
The bore that allows to thread the ball rod must be 25mm test done with a 24.7mm diameter sleeve and showed a slight play.
Here, the template and clutter level, you have no excuse to choose whether or not this tool for me, test laguna 3 in three weeks to see if I made the right choice.
1 star less because the parcel had been lost and packaging clearly not enjoyed the trip!