An increasing number of ATM skimmers targeting banks and consumers appear to be of the razor-thin insert variety. These card-skimming devices are made to fit snugly and invisibly inside the throat of the card acceptance slot. European banks are increasingly moving to geo-blocking on their issued cards. But ATM skimming remains a problem for European banks mainly because several parts of the world most notably the United States and countries in Asia and South America have not yet adopted this standard.”]
Source: https://krebsonsecurity.com/2014/08/stealthy-razor-thin-atm-insert-skimmers/