A: The extra height adjustment holes are called “D” holes, due to their unique shape. They are found on all of Unicare Health’s Shower Chairs, Shower Stools and Over Toilet Frames.
The “D” hole is a registered design of Unicare Health and allows you to adjust one of the legs on your shower chair an extra half adjustment to accommodate for uneven bathroom floors. This is often necessary as bathroom and shower floors are usually sloped to allow for drainage, causing standard shower chairs to rock slightly as they are used. The leg with the extra holes can be slipped off and exchanged for any of the other legs on your shower chair as required.
The “D” holes are shaped differently from the regular holes on your shower chair leg to enable you to tell at a glance which holes are the “halfway” ones.