A few years ago, somewhere online I saw a T-shirt from the band Tool with this design.  I decided to create this wrench for a few laughs and to show my support for the band Tool.  I've modeled this wrench with the Fibonacci sequence in mind, taking the song “Lateralus” into account.  

The Fibonacci sequence is as follows:
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987…

See how many times I incorporated these numbers into my measurements!

Three important measurements:
Open-end: 34 mm
Larger nut: 21 mm
Smaller nut: 13 mm