folding step stool, yours is nice & solid very stable, My mum had one but it was metal tube, I never felt steady on it it's out in the shed now!
This will hold an adult fine. Was designed so my son could reach the sink to wash his hands and we can also attach a small child seat to the top of it so he can help in the kitchen or eat at the worktop. The small gap on the ladder has been fitted with a mini black board for messages for him. 'wash your hands'
Very practical, great job!