I cut through a steel foam insulated door with no problem. Actually, it worked too well. I marked the inside and outside of the door with the intention of cutting the outside metal and then cutting the inside metal of the door. Then I removed the foam insulation. In a matter of seconds, the hole saw drilled through the outer panel, through the insulation, and drilled through the inner panel of the door. Luckily I was able to keep the drill straight and went outside where I marked the inside of the door. Great product that served its purpose.
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