Gravity Conveyors allow a product to glide over the rollers either using gravity or manually pushed along. These are incredibly simple and affordable conveyors. They can be used when workers are available to move the object along manually. Mostly used for moving boxes, cartons and totes. Picking, Loading and unloading trucks, assembly, mounting to lift tables/carts and loading and unloading of machinery are prime examples of gravity co9nveyor uses. When searching remember, it is always best to have no less than 3 rollers under any given item.