Univen blender square drive pin stud, slinger and rubber coupling fits Oster & Osterizer blenders. Univen blender rubber coupling located below square drive pin stud on Oster and Osterizer blender motor base. It has a threaded hole and connects the motor to the square drive pin stud. Fits Oster blenders, Osterizers and Oster Kitchen Centers. Also fits some Sunbeam models which use a metal drive pin. Measures 0.66"(16.76mm) in diameter and 0.615"(15.6mm) in height. Univen blender square drive pin stud and slinger fits Oster & Osterizer blenders. This is the metal pin and washer located on the motor base which drives the blender blade on Oster and Osterizer blenders. This will fit Oster blenders, but not Kitchen Centers. For Kitchen Centers use Univen part OS-24771R. Total length of stud is 0.75"(19mm).