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 10-inch adjustable wrench has a maximum jaw opening of 1-1/8 inch 30 mm and is ideal for use in a wide variety of utility, electrical, and telecommunication applications. features: 10 inch adjustable wrench maximum jaw opening of 1-1/8 inches 30 mm engineered nylon 11 injection molded to tool for maximum personal protection exceeds international standards: iec 60900:2012 and astm f1505 1,000-volt rated for inlive linein applications virtually indestructible – cut, abrasion, and impact resistant withstands temperature extremes from -40 f to 158 f -40 c to 70 c meets stringent requirements for cat inchc inch – cold impact rating every tool is 100% inspected – tested to 10,000 volts / rated to 1,000 volts industry-leading lifetime limited warranty