JOBOX JOBSITE Toolbox 6" Casters - Set of 4 casters- Part # 1-321990. BuyCasters toolbox caster set include 2 rigid and 2 swivel casters, fitted with durable 6 inch diameter by 2 inch wide Polyolefin wheel & sealed precision bearings. Top mounting plate of 4"x 4-1/2" fits most rolling toolboxes. These are quality Casters with zinc plating to fight corrosion, 1/2" diameter axle with grease fittings. With double ball bearing heat-treated swivel raceways, and 5/8" bolted kingpins, these casters are ideal for dollies, platform trucks, shop floors, warehouse carts and freight terminals. These medium / heavy duty Jobox casters are well-suited for food service carts, hotel housekeeping carts, and industrial and commercial equipment. Also ideal installed on drywall carts, welding carts, and wall panel carts. 3" x 3" Hole Patterns For Use With MFG No. 1-681990, 1-658990, 6YG35, 1-652990, 1-653990, 1-654990, 1-655990D, 1-656990, 6YG42, 1-680990, 1-682990, 1-688990, 1-689990, 1-693990, 1-694990, 1-697990, 1-698990