One of the most common errors in ordering chair glides, whether they are Plastic Chair Tips, Rubber Chair and Crutch Tips, Swivel Glides, or Casters is Measurements.   Usually the two most important measurements are Inside Diameter and Outside Diameter.    Inside Diameter is the measurement from inside wall to inside wall of the chair leg.   Outside Diameter is the measurement from the outside wall to outside wall of the chair leg.  Use calipers to measure these measurements, if you do not have calipers, or are still unsure, you can send us a sample of your old glide.   We offer a full line of Plastic Chair Tips, Rubber Chair and Crutch Tips, Swivel Glides, or Casters on our website.