... casters 2.Made of pressed steel, zinc plated 3.Double ballrace swivel head, dustproof seal Gray Rubber Standard industrial ... castersHousing:Made of pressed steel, zinc plated,Double ballrace swivel head, dustproof sealWheel:Materials: Plastic core gray ... have any gaps.*Once the model is selected. manufacture the hole distance, hole size, tap & others of Top Plate & Equipment ...