Mistakeproof stem selection - includes 5 wheels and 10 stem fasteners (5 each 3/8"D x 1"L) (5 each 7/16"D x 7/8"L) for all metal-base chairs
Full hood design - 2"D oversized neck, weight rated 100lb. per wheel
Determine correct stem diameter by removing a caster from the leg of your chair base. Match diameter of existing stem and insert into caster body- Discard the other five fasteners
Comments about Office Star Space Seating® Executive High-Back Chair with Mesh Seat, Black:
I used to only purchase low cost chairs. But, after some back issues, nothing was comfortable. Since I work in IT and spend extended periods sitting, I needed something that would be comfortable and good for my back. I wouldn't normally purchase a chair for this price, but decided my health is worth the cost.
The chair was very easy to assemble. The chair is very adjustable and took a matter of minutes to get a perfect fit for me. I use this chair daily for extended periods and love it. Other people have tried it out and are amazed with just how comfortable this chair is.
I am not a medical expert, but when my back gets sore from sitting in uncomfortable chairs, everything else exasperates it. When I sit in this chair and relax, my back feels better.
I am now a firm believer that getting good furniture is worth the cost.