I sought a way to mount two LED strobe in the rear window of my vehicle without using adhesive, drilling holes, or altering the vehicle in any permanent way. This was the solution. The base of the piece sits flush with the plastic panel on the rear hatch while the lip takes advantage of the gap between the plastic and the glass to hold the pieces in place. Fits a Nissan XTerra, but should be easily adaptable to fit a wide range of cars.