Clear Stair Inside Corner Dust Guards Decorative Triangle - Temu
Stair dust corners introduced at the end of the 19th century to make sweeping easier. They keep dust from accumulating in the corners : r/Damnthatsinteresting
20PCS Corner Dust Guard for Steps, Dust Proof Guard, Stair Corner Dust Guard, Dust Corner Protector for Furniture and for Home Wall Edges - Etsy
What Are Stair Dust Corners (Guards) & How To Install Them
What are these medal things on the corner of these stairs and what is their purpose? : r/whatisthisthing