Chair and Furniture Casters can be confusing. We've asked that you come to this page first so we can try to make it easier for you to choose the perfect caster for your environment. The first thing you need to know is what type of floor have. If you have a HARD floor you need a SOFT wheel on the caster and if you have Carpet you need a HARD wheel on the caster. Next; how is the caster attached to the chair or furniture? A typical office chair will usually have a Grip Ring Stem. Most office chairs do not require an additional Socket. If your chair needs a 7/16" diameter Grip Ring Stem, go to the "Chair Caster" pages. These pages only offer the 7/16" Grip Ring Stem on those pages. If you have any other stem or plate, go to the "Furniture Caster" page for either Hard Floor Casters or Carpet Casters. All attachments are available along with sockets, should you require them. Brake options are offered on "Furniture Caster" pages only. We also have a separate page for "Sockets Only" should you need extra sockets or just want to purchase them without the casters. These hard to find sockets are now available for purchase separately. Sockets may be returned for exchange only, please measure carefully. Sockets shown below fit our casters. They may or may not fit other casters. We have a $20 minimum order which applies to both website and phone in orders.