https://www.fanuli.com.au/furniture/dining-room-furniture/stools/kitchen-stools/sharky-stool-aluminium/ 

The outdoor version of this design is finished with an aluminium frame to form an extremely durable product. The high stool entirely replicates the seat of the chair and becomes a comfortable bar stool, whereas the low stool has a different seat, shortened for a more harmonious overall effect. The two fin-shaped coupling elements between the frame and the base clearly remain on the rear part; a technical detail that is the key characteristic of the project. These two versatile stools can be used in the home or as a distinguishing feature of a project at a restaurant, bar or hotel.