Black hidden knife kubaton keyring has a 2 1/2 inch blade hidden inside its aluminum body. The end unscrews and reverses to either hide or reveal the blade. Approximately 6 1/2 inches overall with the blade out and 4 inches with the blade hidden. Has a knurled handle for great grip. Relatively small size makes this kubaton easy to carry as a self defense supplement and the knife is sure to find convenient utilitarian uses.