Here at Kienstra Precast we have round forms (24", 36", 42", 48", 60", 72", 96", 120" & 144" DIA) and our flatwall  panal forms allows us to pour virtually any configuration of structures. We also have the ability to pour structures with angles to the walls. If you have a ideal for a concrete structure just contact a member of our team and we can help you with the designing and fabrication of this structure.