Klein Tools 1656 Series Chicago Grips have a round, smooth inside jaw contour making it perfect for work with stranded copper cables. These smooth jaws grip with maximum contact and are less likely to cause cable deformation. 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.