Many of the fasteners utilized in tools, dies, molds, and even our EDM machines are of the Allen head internal hex socket design, and most of us have an Allen wrench set or, even better, a Bondhus set in our toolbox. However, when it comes to serious wrenching, I rely on my Chapman wrench set. Made right here in Connecticut, my set comes in a durable plastic case with real hinges - not the cheapo "living hinges" that break off in less than a year.
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