These can be used as book ends, shelf brackets, or simply fitted to a tub. Even though different tub feet mount differently they can be welded in place on any tub. We have over 10 tubs here at all times, these start at $350 including feet, and range in size from 4'- 6' with the most common being around 5'. Claw feet average, 6-1/2"x 4-1/2" in size.