These tall bell shaped glides have many stem options to fit almost any chair. Please specify the stem option accurately. High profile glides are often used to maintain chair height when replacing caster wheels. This is a very simple way to make a rolling chair stationary. Easy installation. 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 your choice of 4 or 5 pieces per set, specify your choice below. 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 chair glides do not meet your needs, just return within 30 days for a refund. Shipping is not refundable. If you have any questions, please call toll free.