Please search the forum sticky's for how-to documents and templates.
If you go to the left menu and click Lockpicks-Manual start scrolling from the top and check out the sticky documents, here's an old thread with templates and pick shapes, some links no longer work but some do.
Print this and compare the ruler scale at the bottom to your ruler in millimeters until they match, then you'll know how big a real pick is, based on this image:

Squelchtone