The Savanah bath step is a 4inch (2.5cm) step to assist getting in and out of the bath. The steps can be stacked in multiples to create a larger step. For each step that is added, a further 2″ (2.5cm) is gained. The Savanah bath steps will also clip together when arranging horizontally to improve stability. You can safely add up to six steps vertically if required.
April 2012, 2 year update. The bath steps are still in service and show no signs of wear. I was even able to clean the construction detritus off of mine so that it looks fine now.