The wiper comprises an arm (14) which is connected to a drive head (10) by a pivot (20) in the form of a bar across the end of the head which engages with a recess in the end of the arm. The pivot components are held together by a central rod (24) between two cylindrical ends (20) in the end of the drive head and a projecting lug (40) in the centre of the arm opening which connects with the head. The lug limits the central portion of the arm aperture to a slot which engages with the rod at a certain angle only, ensuring that the two components cannot become disengaged accidentally. The rod has a semi-cylindrical face and two flat parallel surfaces, forming a portion with its thickness equivalent to the width of the slot.
