Footing Forms from Bigfoot Systems, Inc. Created: June 9, 2010 Fit all 6-in. to 18-in. construction tubes Models available for residential, commercial and industrial applications Four models in concrete volume sizes from 1.75 cu. ft. to 6 cu. ft. Features include air vent holes and ribs for structural strength Want to know more about this product? Click here to request more information about Footing Forms from Bigfoot Systems, Inc. .