Round glass blender jar, fits Oster blenders, 4.5" opening.
Round 5 cup, glass blender jar. Fits Oster and Osterizer blender models 4122, 4123, 4125, 4126, 4127, 4128, 4132, 4134, 6648, 6653, 6656, 6657, 6658, 6663, 6665, 6667, 6668, 6679, 6692, etc. Has 4.5" round opening.