The Klein Tools 86520 5-Blade Duct Crimper produces factory-precision indentations in stove pipe and round duct with just a squeeze. The Klein Tools 86520 features a compound-leverage mechanism that makes precise indentations on 24 gauge steel and 28 gauge stainless steel. The 5-Blade Crimper features comfortable, contoured grips that cover hardened steel handles and a convenient self-opening tool latch for one handed operation. The all steel construction with nickel plating provides long life and durability.