... .At the bottom of the tube aluminum plate. Cast 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 ... . 6)Delivery by sea or air on time. Cast aluminum umbrella base Plinth base plate