"A determined soul will do more with a rusty monkey wrench than a loafer will accomplish with all the tools in a machine shop." - Robert Hughes
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I don't know about Vlchek but the largest nutdrivers I've seen (VACO) go to 9/16". I had a complete set that went to 1/2". Some other brand went to 5/8" I think. After that the small driver grip doesn't give one enough torque to get any bigger stuck fasteners off.