Official Timken replacement trailer taper roller bearing.High quality bearing designed for high speed trailer use.- Inside diameter: 2.000"- Width: 0.9688"- Cage Type: Stamped Steel- Number of rollers: 21- Industry standard Part #: 28580- Use with matching race #: 28521 (sold separately)- Commonly used on AL-KO general duty, Rockwell American, and Quality 10,000 lb axles.- Inner bearing in AL-KO 568353 and 568270 hubs.- Inner bearing in 99865-1PA and 99865-1P475A hubs.