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Precast circular rings were used for form large circular openings in the top slab for this project. This saved time, money and also improved the accuracy of the shape and placement of the openings in the slabs. It is also possible to have details like offsets for placement of glass in the circular openings and inserts for providing anchorage with cast in situ slabs. Notice that round cornice at top of beams was also formed with forms that we supplied.