Car safety is important and this tool is a must! One end is a seat belt cutter and the other end is a hammer for breaking glass. Should you ever find yourself in the position to need it, it can be life saving. Linked a set of 2 - share one with your friend, sister, etc. and definitely your teen driver! Car Safety, Car Tools, Driving, Vehicle, Amazon Finds LTKSaleAlert LTKTravel LTKmomlife