It fits perfectly over well and it now  serves as a well cap. The pedestal is hollow but, customer service could not give the internal dimensions. To their defense, the pedestal is hollow (which for its current purpose is a good thing). I had to use a skill saw to cut and remove the thin plastic from the bottom. With the base removed. The pedestal fits perfectly over a well post the is 12 inches talk and 6 1/2 inches in diameter. Still need to level ground so it fits level. It looks fantastic. Best part is it looks fantastic and I don't have to look at the well cap sticking out of the ground in the entrance to my hidden garden.