This gravity-fed tailgate spreader has a powered spinner to help de-ice driveways and small strip mall parking lots. 9" Diameter spinner casts rock salt up to 24'. Tilt hopper down to access the back of your Jeep, SUV, or truck. of salt. The slanted walls in the hopper channel the material down the chute, using gravity to feed the spinner. Activate the spinner with the on/off toggle switch, which plugs into the 12V accessory outlet