Practical modern wiper motor for continual use 12 volt. polished stainless steel cover, will 'auto-park' to one side. central drive offtake (6mm), requires 9.0mm shaft hole through screen, with one stabilising mounting, body approx 56mm x 80mm wide x 77mm deep oscillating 90 degree sweep. outer shaft approx 61mm long, inner shaft approx 78mm which can be cut shorter if required. this unit requires a separate switch.