This makes use of the indentation at the bottom front left of the dashboard, right at the bottom of the windscreen. Two 20mm long, 6mm diameter springs fit inside the legs and hold the card holder snugly up against the windscreen. The cardholder is sized for credit-card sized parking passes etc. Be sure to orientate the cardholder so that the opening of the slot is uppermost to have best results when printing. I also recommend tree supports for this print.