Made of high-quality gray iron • Genuine Timken Tapered Roller Bearings of vacuum degassed steel which gives rollers and races added life, provides superior load and speed characteristics • Drive collar on each end of inner race with 2 headless set screws spaced 120° apart, locking it to the shaft • High radial and thrust load capacities • Completely assembled, adjusted, sealed and pre-lubricated at the factory • Built-in balanced labyrinth seals guard against loss of lubricant and admission of dust and dirt.