Stool KULLABERG.
The diameter of the seat is 34 cm.
Height-adjustable seat for optimal comfort.
Min seat height - 47 cm; Max seat height - 69 cm
Tested for -110 kg
Adjustable legs ensure stability even on uneven floors.
The metal ring on the chair support can serve as a footrest.
The multiplicity of the seat travel in the model is 55 mm (470, 525, 580, 635, 690).

https://www.ikea.com/en/en/p/kullaberg-taburet-chernyy-80363657