This is a wall adapter for the following bathroom accessory:
https://www.amazon.fr/dp/B0C75JKQTK
You only need it if you already have 26 mm separated wall holes.
There are 4 versions of the same adapter, with different tolerences: 0.2mm; 0.3mm; 0.4mm; 0.5mm. All should fit well. The 0.2mm is formally "approved" in situation.
shower_head_holder-tolerance_0_2_mm.stl | 222.7KB | |
shower_head_holder-tolerance_0_3_mm.stl | 230.4KB | |
shower_head_holder-tolerance_0_4_mm.stl | 823.0KB | |
shower_head_holder-tolerance_0_5_mm.stl | 857.9KB |