a windscreen wiper device of the flat blade type includes an elastic , elongated carrier element , as well as an elongated wiper blade of a flexible material and a connecting device for an oscillating arm with the interposition of a joint part . the said joint part is detachably connected to said connecting device by engaging protrusions provided with co - axial through holes of said connecting device in recesses provided in said joint part . an upper surface of said joint part comprises a central recess arranged to accommodate a free end of a rod - shaped oscillating arm of a first type ; a l - shaped shoulder near a free end of an oscillating arm of a second type comprising a transverse pivot pin , wherein said coaxial through holes are arranged to receive said pivot pin .