3m rise, 15 steps clockwise 2.67m rise, 13 steps clockwise 2.43m rise, 13 steps clockwise 3m rise, 15 steps anticlockwise Our cast iron spiral stair is one of the finest spiral staircases on the market. Traditional in design and beautifully crafted the stair has a number of features. We have range of balsutrade options to choose from. It can achieve any height with the addition or removal of treads to meet any building requirements.