A quarter of Nightlock annual sales were shipped just in June, and the owners believe the tragic shootings in Uvalde and Oxford and school districts wanting to prepare for the upcoming school year contributed to the dramatic increase in sales.

Seen in the video player above is a Nightlock, which is a security tool, and it makes a door almost impossible to open. They are made here in Michigan in Mount Morris, just 30 miles from Oxford High School, where tragedy struck back in November.

Security devices that were installed at Oxford High School just a few years ago may have prevented the shooter from taking even more lives.