This tail cap upgrade has been specially designed to fit the Stinger, Ultra Stinger, and Stinger HP flashlights. Bust-A-Cap has no moving parts and can be deployed with either your strong or weak hand. Easily attachable to your existing flashlight or baton, this Bust-A-Cap attachment is a rapid entry tool designed by a 13-year veteran of one of the largest Sheriff's Departments in the United States. This glass breaking cap is used by law enforcement, fire departments, government agencies, private security firms, and civilians around the world. The Bust-A-Cap is designed to break through glass minimal collateral damage, ideal for safe entry or exit from automobiles, houses, boats, or planes. This attachment can be installed in less than a minute and requires no training. Bust-A-Cap can save your life as well as the lives of others!