Klein Tools' 1613 Series Bare Wire Chicago Grips are designed to work with solid and stranded bare wire from 0.08-Inch to 0.20-Inch (2 mm to 5.1 mm). All Klein grips are manufactured from custom drop-forged steel that is machined and heat treated for excellent durability. Each grip is individually hand inspected and actuated for proper function. Grips are also rigorously tested and pulled to rated load to ensure the highest quality and reliability.