... aluminum umbrella base Plinth base plate1) Environmentally-friendly.2)Surface treatment: Mill Finish, Anodizing, Powder Coating, Polishing, Brushing, Sand Blasting,3)Material: Aluminum alloy,ADC12 ... ,ADC6,Alsi12,Alsi9cu3. 4)Aluminum casting:88T,180T,280T,420T,600T,800T. 5 ...