Chicago® Grip for Bare Copper WireChicago Grip for Bare Copper Wire Finding the best grip to pull small copper can be challenging. Copper stretches over time becoming too thin for some grips which may cause slippage. Some smaller grips are harder to manipulate when wearing rubber gloves and are not hot latch compatible. Using a grip that's too big, too strong or too aggressive could damage the cable. Klein Tools' 1613 Series Bare Wire Chicago Grip is big enough to work with gloves but