This wheel set is an accessory for the Maxxheat. It has a universal form, which makes it also suitable for Electric Weed Killers from other brands. With these wheels, you can use the Maxxheat for a longer time, because it does not require strength to lift the Maxxheat up after every piece of weed. You simply roll the Maxxheat over the weed, and the weed will disappear after a couple of days.