A roller clamp includes at least two opposing and spaced apart side walls, a guide wall, a further wall opposite the guide wall defining an aperture therethrough, a hollow body and a roller. The hollow body has a body aperture therethrough. The roller comprises a roller wheel having two axial projections protruding from a center of each side of the roller. Each side wall is provided with an opposing guide groove on the interior surface thereof. The two axial projections of the roller wheel are slidingly seated in the guide grooves so that the roller can move in the aperture of the further wall as the projections slide in the grooves. At least one respective long edge of each corresponding guide groove is provided with at least one notch. The resulting at least one pair of corresponding notches can at least partially seat the two projections.
