These are four legged chrome bar stools.
Bar stools are a type of tall chair, often with a foot rest to support the feet. The height and narrowness of bar stools makes them suitable for use at bars and high tables in pubs or bars.
Prior to Prohibition, bar stools in America were not used in drinking establishments, but in food establishments. Bars without stools were the norm, and that was considered “an American peculiarity.” The normal seat height for a bar stool is 30″ (76 cm) with a 26″ (66 cm) stool being used against kitchen counters.
The styling of the 1950 and 1960s uses chrome and vinyl stools combined with matching benches or diner chairs.