All kind roller blinds components and rod Roller blinds mechanism:25mm,28mm,32mm,36mm,38mm,43mm.Ball chain: 4.5*6mm,4.5*12mm, white or clear.Head rod: 25mm,28mm,32mm,36mm,38mm,43mm.aluminium and ironHead rails: for fit to head rod and assemble to wall.Bottom rod: PVC and aluminium. round or sew-in flat.Endcap:for botton rod metal ball chain