Abstract: A data carrier in the form of an elastic ring segment has a radially outwardly facing surface to which the data providing tool information, are applied for example by printing. The ring segment has at least one radially inwardly effective connector element that forms a snap-on connector for securing the data carrier in an elastic, releasable manner to a connector area of a tool carrier to provide an elastic, interlocking form-fit between the data carrier and the tool carrier. Thus, the data carrier can be easily exchanged or replaced in accordance with the type of tool carried by the tool carrier.