Univen 5 cup, square glass blender jar compatible with Oster and Osterizer blenders. Compatible with Oster blenders, Osterizers and Oster Kitchen Centers models that use a 5 cup jar with a square top. Use with Univen OS-060 lid and Univen OS-055 bottom cap or the original Oster lid and cap. Jar is 8.25" (21cm) tall. The inside diameter of the top of the jar measures 4" x 4" (10.16cm x 10.16cm). Quality part by Univen.