I ordered this spanner thinking it would open wider than others and be easier to use.  I was wrong, and was reminded of the old saying...you get what you pay for.  The spanner jaws do not expand all the way out and when you expand them to the widest, the screw thingy in the middle disengages from the jaws and is difficult to re-engage.  Spanner is not wide enough to open the backs of larger men's watches like Diesel, Croton, or Invicta.  Wasted my money.