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MUSCATINE, Iowa -- Some Iowa teachers have taken the protection of their students and themselves into their own hands thanks to a creative safety solution.

"The Sleeve" is a twelve gauge carbon steel case that slides over the door's closer arm, securing it from the inside. It has been tested by engineers and is able to withstand over 550 foot-pounds of pressure.

The product was designed to keep an active shooter out of the classroom.

“We look at it as a cheap insurance policy. If you have someone out in the hallway, and you have an active situation, a dangerous situation unfolding and you do not want to go out into the hallway and lock your door, we want to provide you with a way to disarm that door,” says inventor Daniel Nitzel.

"The Sleeve" is still patent pending but Muscatine Community College has already said it will have one fitted in every classroom in Larson Hall and the library.

You can purchase "The Sleeve" here.

Learn more on this story from WQAD.