The 6.5-4-1891 yoke belongs to the 1810 series and is built for heavy-duty applications. It has a spline count of 16 and a spline diameter of 2.350 inches. The hub diameter is 2.875 inches, and the through hole measures 2.750 inches. With a centerline to end distance of 5.500 inches, this yoke features a BP style and is produced by Spicer.