22 in. x 16-1/2 in. x 22 in. Plastic ncrete Footing Form SQUARE FOOT Model SF22 Plastic Footing Form SQUARE FOOT Model SF22 Plastic Footing Form 22 in. x 16-1/2 in. x 22 in. used in njunction with 8 in. and 10 in. ncrete forming tubes. Depending on your project size will determine what size of lumn should be used in njunction with our