Some of my SAE 1/2" drive socket sets have a 1-3/16" socket in them. So far I have used every socket, both standard and deep, except the 1-3/16" size. At one time I found a wide flange serrated lock nut that came close to fitting a 1-3/16" socket but they appeared to measure the distance in 1/64" increments. The amount of play would have been minimal but at the time I did not know how much play a factory socket has in it when properly sized to fit a nut. To this day I have not encountered a fastener that was made to use a 1-3/16" socket on. On the other hand the rest of my 1/2" drive socket set as well as my 1/4", 3/8" and 3/4" drive SAE socket sets still work on a lot of stuff.
I've used a 1-3/16" socket to remove 30mm bolts on a tractor's loader mount since I did not have a 30mm socket that that time. It worked fine the times I've had to do it, but I have since purchased 30mm wrenches and sockets.
Buy a Metrench set and be done with it. 
