On Time Supplies is open for order placement 24/7. However, our customer service will be closed on Friday, July 3 in observance of Independence Day.
We wish you and your family a happy and safe 4th of July!
Thanks for your question.
As a general rule, caster sets do come in a pack of 5,. We well casters for a variety of different stem sizes.
Here is a link to our casters with a "B" stem.
For information on how to choose the best caster for your chair, please see our Office Chair Caster Guide.
Please let us know if you have any additional questions.