This TIMKEN HM-903210 Tapered Roller Bearing Cup is a high-quality unit made of steel material. 

The outer diameter of this bearing is 3.7500 inches with a width of 0.8750 inches. It comes with one piece per unit and is suitable for various industrial applications. The manufacturer part number is 917217-R1, and it is designed to fit the HM-903249 bearing assembly. 

This tapered roller bearing cup is an excellent choice for those seeking a durable and reliable part. The brand is Timken, a trusted name in the industry, and the product is suitable for use in ball and roller bearings, mechanical power transmission, industrial automation and motion controls.