How It's Made? - Wrenches - Tool Parts DirectFeb 5, 2016 . Original wrenches were first made of cast iron, but eventually shifted to steel for stronger durability and . The Manufacturing Process . First, a steel bar is sent into a die cutting machine which cuts the bars to a certain length.machinery manufacturing metal wrenches,Wrenches - Reed ManufacturingReed offers the full line of traditional pipe wrenches along with specialty . Forged alloy steel replacement pipe wrench parts meet the most demanding.
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