A windscreen wiper arm

A windscreen wiper arm (8), particularly for automobiles, comprising a mounting head (18) mountable on a drive shaft (19) and an arm member (20) pivotally connected to the mounting head (18) by means of a pivot pin (21), wherein the arm member (20) has a substantially U-shaped cross-section near pivot pin (21) comprising two side walls (25,26), wherein a part of the mounting head (18) extends between the side walls (25,26) and beyond said pivot pin (21), with the special feature that protrusion/groove means are provided on said part (18) and said side walls (25,26) for limiting a pivot angle of the arm member (20), wherein the protrusion/groove means comprise at least one curved guiding groove (30) and at least one protrusion (29) cooperating with said groove (30).