Jordan Steranka, a designer and photographer, has created a wrench inspired by the aperture. The Aperture Wrench can be adjusted to fit a nut of any size, making it an extremely useful tool. It has blades similar to a diaphragm, and can be locked in depending on the size required, eliminating the need to carry multiple wrenches. Unfortunately, the design is not yet slated for commercial production. 

You can learn more about the Aperture Wrench at Petapixel