Can you tell me please which manufacturing process I would need to employ in order to produce a PVC spike approx. 550mm long, which is a cruciform cross section, which incorporates (at its uppermost portion) a flanged end 200mm square by 12mm thick. The fins in the cruciform also being 12mm thick. As depicted on the attached word document. It is estimated we will need around 50,000 of these items each year. Thanks.