“You can use an eraser on the drafting table or a sledgehammer on the construction site.” - Frank Lloyd Wright
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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.