Product Description Klein Tools' 1611 Series Chicago Grips have a round inside jaw contour designed to hold weatherproof strand and solid coated wire. They also have a notched jaw to provide a firm grip on insulation. 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. From the Manufacturer Klein 1611-20 Chicago Grip-for Weatherproof Wire. The Klein 1611-20 Chicago Grip-for Weatherproof Wire features a round inside jaw contour for weatherproof coated wire and notches in jaw that provide firm grip on insulation. Note: Due to various types of weatherproof coatings available, selection of proper grips is determined by outside diameter of cable. The Klein 1611-20 Chicago Grip-for Weatherproof Wire has a jaw length of 4-3/16-Inch (106), a cable range of .20-Inch-.40-Inch, and a maximum safe load of 4500-Pound.