Oster 124461-000-000 Osterizer Clover Glass Blender Jar 5.25 I.D. - 5.38 O.D. Osterizer 124461-000-000 Square Glass Blender Jar Jar opening is approximately 5 1/4 Inch Inside Diameter Jar Outside Diameter is approximately 5 3/8 Inch Diameter Lid, Blades, Gasket and Container Ring Sold Separately Fits most oster blenders