Comtech Stinger James Keating Re-designed Self Defense Tool (w/ Key Ring) (Grey) The lightweight Stinger Key Chain could just get you out of a situation you don't want to be in. Can also be used in healing arts such as acupressure. When held properly, the Stinger aligns itself with the arm bones and its blunt nose becomes an effective power focus. The carry hand retains over 50% of its normal manual dexterity.