The Defiance Tools Skull Keychain EDC Tool - 8 In 1, easily attaches to a keychain ring, so it fits easily into your pocket or purse. With it, you can turn a screw, tighten a bicycle spoke or cut a piece of rope or twine.The Skull Keychain EDC Tool - 8 In 1 is made from lightweight 3CR13 stainless steel with a super tough blackened finish.