Safer Schools for America created the School Protection System (SPS) specifically for Classrooms intended to prevent a gunman from entering a classroom and causing harm to children and teachers. The SPS system features the Insta Remote Lock and the Universal Bullet Resistant Door Shield. The Insta Lock lets the teacher lock the door from as far as 75 feet away with a push of the button. NO need to panic or run through a crowded class room. The Universal Bullet Resistant Door Shield fits any classroom door and makes it Bullet Resistant. The Shield installs in 20 minutes using Tamper Pruf security screws. The shield was placed on a wood door and resisted over 130 rounds of 9mm, 38, 44 mag, 12 gauge slug and pellets (see video on site).