Don't waste your money on this watch tool.

When mine arrived, the center wheel that adjusts the top two pins was wedged onto the shaft lopsided and therefore would not turn either forward or backward due to binding on the metal plate on the top and bottom of the tool.  This rendered my tool inoperable.  I had to totally take the tool apart, adjust the pins to the right dimensions and reassemble the tool for it to be functional.  But I had to do all that for one watch.  If my next watch was a different sized case back, then I would need to repeat the process as that was the only way I could adjust the pins.

I then decided it was not worth the cost to return the item and prompty disposed of it in the garbage and then ordered a quality tool from another manufacturer.