can also be achieved by other equivalent means for example by snap in or clamping connections the present invention is therefore not limited to the use of latching and mating latching means in order to permanently fasten the guide adapter 250 to the base connecting device 160 a plurality of shoulder shaped retaining indentations 362 364 366 368 are provided thereon column like projections 392 398 are formed in the axial end regions of the base connecting device 160 and for example two pin shaped projections 394 396 are provided in the central region of said base connecting device said projections 392 394 396 398 serve as positioning elements in order to enable precise alignment and installation of the guide adapter 250 as described below for fig6 furthermore at least the positioning elements 394 396 have for example according to an embodiment pin like extensions which are formed in the direction of the wiper strip 112 and can be fixed to the wiper strip 112 during the fastening of the base connecting device 160 in order therefore to prevent the device 160 from slipping on the wiper strip 112 the extensions here may be pressed for example in the manner of nails into the wiper strip or may be anchored there by displacement of the rubber material of the wiper strip 112 the adapter unit 150 with the guide adapter 250 and the function adapter 280 the upper sides 387 and 399 respectively of which are shown in fig3 is produced for example from plastic the guide adapter 250 is designed by way of example in the manner of an upside down u profile and has a platform like base element 339 on which.