Vestil Poly-on steel Caster Kit 6" x 2" Casters for the self-dumping hoppers create a more worthwhile portable unit. Casters are constructed of Poly-on steel for strength and durability throughout a lifetime of use. The high capacity allows the simple transport of heavy loads promoting task efficiency. Casters are bolted-on by utilizing the factory stamped hole in the fork tubes. Designed to be easily installed on hoppers, Casters allow hopper units to be transported without the use of a fork truck, Robust assembly provides long lasting resilient use, Both rigid and swivel designs included for maneuverability.