High quality cast iron for high material stability Precision machined for smooth surface and comfy turning Chrome plated surface, hardly peels, and or flakes Mass production for an economical price Large stock of popular sizes for prompt delivery Customization available according to your specifications and drawings HB outside diameter: 3, 3.5, 4, 5, 6, 7, 8, 10, 12, 14, 16, 18, and 20 inches