Tall bell shaped chair glides offer high quality and visual appeal. Tall chair glides are often used to maintain chair height when replacing caster wheels. They will fit many typical office chairs, stools, etc. This is a very simple way to make a rolling chair stationary. Easy installation, just pull out the old chair wheels and insert the new chair glides. These glides are offered with one common stem size of 7/16" diameter x 7/8" long. The black nylon body of the glide is 2.25" from top to bottom. The diameter of the glide base is 2.2". This product is offered in sets of 5. Specify a quantity (Qty) of 1 for 1 set.. 2 for 2 sets.. etc. To help protect your 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.