Cutting a Large Mat Board with Nick

What's Nick doing with an 8ft. piece of aluminum from the hardware store?

[@jklovell]

Thank you so much. I was worried I wouldn't be able to mat an oversized print.

[@MrLuckyjc]

Great video! Thanks I’ll using your method for my large Mat boards

[@mail06513]

Great video.

[@zing_go_the_strings]

What's the material that is under the metal guide? Whatever it is, does the cutting blade cut into it? Thank you!