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The utility knife blade is made of SK-5 high carbon steel, trapezoid-shaped blade. And the blade is thicker than the normal utility knife, the heavy duty box cutter are more sharp and durable. The shell of box cutter knife is made of aluminum alloy, comfortable to hold. As long as you use a screwdriver, you can replace the razor blades. When replacing the blade, you'd better wear gloves. Press and hold the slider to change the blade length. Different blade lengths help you cut different materials, easy and convenient.







