These high quality chair glides are a standard size that will fit many typical office chairs, stools, etc. This is a very simple way to make a rolling chair stationary. Just pull out the old chair wheels and insert the new chair glides. Metal stem length is 7/8" and stem width is 7/16". The bottom of the metal stem has a standard 1/8" thick shoulder. This offer includes a complete set of 5 chair glides. Specify a quantity of 1 for 1 set.. 2 for 2 sets.. etc. To help protect your hard floors, you can optionally purchase stick-on felt pads. Or to reduce chair movement, you can optionally purchase stick-on gripper pads. Satisfaction guaranteed, if product does not meet your needs, just return within 30 days for a refund (shipping is not refundable). If you have any questions, just call toll free.