This is a brand new, factory sealed, office chair part: This heavy duty office chair part was made by a major office furniture company. In fact, this part was manufactured in the very same factory that makes office chairs and parts for some of the largest office product retailers and furniture brands. We have a special arrangement for a limited number of "unbranded" office chair parts to be made exclusively for distribution through us. This stylish Chrome base will bring any office to life. The heavy duty 5 star frame will turn any ordinary office chair into a super strong and incredibly durable one. The base accepts standard 7/16 x 7/8 inch caster stems and supports standard 2 inch gas lift cylinders. This base is simple to install on almost any office chair. You can rest assured knowing that you are getting a quality product that is designed with the user in mind. (wheels not included)