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Insulated hand tools from Jameson provide maximum electrical protection and are suitable for working live or close to live parts at nominal voltages up to 1,000 volts. Constructed using heavy-duty injection molded Nylon 11; the 12-inch Adjustable Wrench has a maximum jaw opening of 1-3/8 inch (35 mm) and is ideal for use in a wide variety of utility, electrical, and telecommunication applications.