The 5-Blade Crimper from Klein Tools produces factory-precision indentations in stove pipe and round duct with just a squeeze. Compound-leverage mechanism 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.