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 ga steel and 28 ga 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.