Electrical two-speed wiper switches. For heavy duty permanent magnet electric wiper motors. With dynamic parking: For use with Robert Bosch and Sprague Devices motors. 12V/24V DCSealed construction, including O-ring on the shaftBlack plastic knob w/metal insert & set screw, white imprintMounting stem 7/16" -28 thread, .45" (11.4mm) longDiecast case 1-5/8" (41.3mm) diameter