The Timken 78225/78551 Tapered Roller Bearing Cone and Cup set is a high-quality mechanical component made in the United States. With a 2-1/4″ inner diameter and 5.513″ outer diameter, this bearing is designed for industrial automation, motion controls, and other mechanical power transmission applications. The tapered roller design ensures smooth operation and durability, making it a reliable choice for various machinery and equipment.