oneConcept Arielle Deluxe Manuel D'utilisation page 11

Installation
Note: Place a blanket in the area where you will install the seat to protect
the surfaces of the shower or bath from parts that may fall during assembly.
Note: Please check with skilled workman on drilling instruction. The
process might be different depends on your wall type. Please check with
skilled workman if your wall is suitable for installation. We recommend you
to install on concrete wall or solid brick wall.
Determine the horizontal and vertical position of the seat. Determine and
mark the position of the top hole on the left side of the wall bracket as
shown in Figure 1 (a).
(1)
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