Bertoia Diamond-Bird-Side Chair Glides, also for Bertoia Bench
Prevents your floor from scratches, marks and scuffs
Lexan plastic, clear, felt

fits 9.5mm to 11mm (3/8" to 7/16"). The Bertoia round steel is 7/16" (inch) thick, which is equivalent to 11.113 mm.
Bertoia Diamond- Bird- Side Chair Glides are matching for Knoll int. chairs

Instruction video on YouTube: https://youtu.be/ZRtU02dE7MM

Installation:
To attach the Diamond-, Bird & Side Chair glides on the round metal base you need a pliers (eg a pipe wrench) and to avoid damaging an intermediate layer to the round metal (eg, a towel, a piece of thick felt, or a piece of soft wood).

You put the intermediate layer on top of the round metal of the Diamond or Bird Chair base and the glide under the round metal. Then you grab wood, round metal and glider with the pliers and push it onto the round metal. The glides fit to 7/16 inch, which is the round metal of the Diamond and Bird Chair frame. Therefore, some force is required.
It may in really exceptional cases (approx. 5%) be possible that the chair glider is twisting on the rod. In this case please stick a strip of double sided tape into the chair glider to fix it.

Harry Bertoia was an Italian-born American artist, sound art sculptor, and modern furniture designer.

At the age of 15, given the choice to stay in drought ridden Italy or move to Detroit , Harry chose to adventure to America and live with his older brother, Oreste. After learning the language and the bus schedule, he enrolled in Cass Technical High School, where he studied art and design and learned the skill of handmade jewelry making. In 1936 he attended the Art School of the Detroit Society of Arts and Crafts, now known as the College for Creative Studies. The following year in 1937 he received a scholarship to study at the Cranbrook Academy of Art where he encountered Walter Gropius, Edmund N. Bacon and Ray and Charles Eames and Florence Knoll for the first time.

The Diamond Chair is part of a series of furniture that have been designed by Harry Bertoia in the beginning of the 1950s. All of this “wire frame furniture” are welded by hand. Bertoia, as he was a sculptor and silver smith, placed a square on the point and pulled it longer - a form game with pleasant results: The lounger is weightless and comfortable, he saw his chairs as "studies in room, form and metal" .
Knoll offers the Diamond chair in different editions: chrome plated or black coating usable as outdoor furniture.

Placed in many collections of famous design museums, the Diamond Chair from Bertoia is a classic.
The Diamond Chair is an extremely comfortable seating furniture.