The Florida school shooting that claimed the lives of 17 students and faculty in Parkland wasn't the first school shooting of 2018 -- and statistics suggest it won't be the last.

That's why a Wisconsin student is sharing an invention that he hopes will save lives when the next school shooting happens.

KARE-11 reports Somerset High School senior Justin Rivard was inspired in his shop class to create a device called the "JustinKase."

"You don't want to use it, but just in case you need it, it'll be there," he told the TV station.

The device, made of steel plates and connecting rods, is placed under a classroom door where it latches to the door's jamb. Rivard says no one's been able to push a door open with the JustinKase, even testing it with high school football players, and he believes it can stop a shooter from entering rooms to target students inside.

"You can lock a door with a lock, it can get shot out," Rivard, who's joining the Army when he graduates, told KARE. "You can lock a door with this, it can't get shot out. You can't get around it."

Somerset High School, located just 35 miles east of Minneapolis, Minnesota, has already ordered 50 of them -- one for every classroom in the building. Principal Shannon Donnelly said students and teachers immediately conducted a safety drill using the JustinKase devices.

Other schools in Wisconsin have also ordered the device, Rivard said. The JustinKase, currently awaiting patent approval, is being sold online for $95 at dominatesafety.com.

Nikolas Cruz, 19, appeared in court Monday on charges of killing 17 at Marjory Stoneman Douglas High School in Parkland, Fla., last week. He legally purchased at least seven long guns, including an AK-47-style rifle, law enforcement officials said.

The Florida school shooting was at least the sixth deadly attack on students and teachers in 2018, according to USA Today, and the deadliest since 27 were killed at Sandy Hook Elementary School in Netwtown, Connecticut, just over five years ago. Thirty-two were killed in the 2007 Virginia Tech shooting, 15 died at Columbine High School in 1999, and the 2015 Umpqua Community College shooting left nine dead.