ESD has created unique auto glass-breaking caps to work on your existing flashlights. They are machined from aerospace-grade 7075 aluminum to exacting tolerances. All caps are. Type lll hard anodized. All materials are purchased and all products are manufactured in the United States. ESD Products LLC has spent years in research and development and conferred with emergency professionals to create safe and effective flashlight end-caps that will replace the OEM tail cap on your existing flashlight. We have developed an innovative product that is made of lightweight, aerospace grade materials to exacting tolerances. With a unique, patent-pending NO SNAG profile, ESD caps have no sharp points to accidentally puncture or lacerate. The steel, rounded strike-point is very effective in shattering auto tempered glass with little effort. ESD caps provide a safe and effective emergency escape tool for your home, vehicle, boat, airplane, or personal carry-on flashlight.