Chicago Piper industrial INC., based in Chicago, founded in 1968, is a company concentrated on the research and development of bolt disassembling system. It adheres to the principle of excellent quality and considerate service to provide safe, effective and easy-to-operate Hydraulic Torque Wrenches, Hydraulic Bolt Tensioners, Hydraulic Torque Pumps, Electric Torque Wrenches and Pneumatic Torque Wrenches.