Lifehammer Safety Hammer Evolution LHEBL0016 1 4" overall. Automatic safety hammer is easy and safe to use by adults and children. Simply press the head of the safety hammer against the car's side window and the ultra hard, spring loaded ceramic hammer head will come out, shatter the window and reload automatically. Directly after shattering the first window this action can be repeated several times. Non slip orange and gray polypropylene handle with integrated seat belt cutter. Comes with