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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,Company Wrench | Heavy Equipment & Attachment Rental & SalesCW Machine Worx is Company Wrench's in-house manufacturing and fabrication company. CW Machine Worx provides professionally engineered customized.Socket Wrench , Socket Wrench Manufacturers on mining and constructionManufactures .Information about Socket Wrench manufacturers & suppliers are presented. . Our products include Socket Wrench, hardware, hand tools & metal products, . Ko Shin Electric & Machinery Co., Ltd. is a professional manufacturer of.