This kit represents a standard riveted steel tank as built from the late 1800's to the present time! They were used to store almost any liquid, most commonly oil and gas. Very often they store water and in industrial settings almost any liquid chemical. The kit includes one piece molded rings with shiplap joints so there are no unsightly vertical joints on the finished model. You can build either the curved stair or a vertical ladder with or without a safety cage! Also includes both a flat or conical top. Concrete base. 4" in diameter and 7" high! Easy assembly!