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21, 75/76/78-Light Medium Duty with Dust Cover Series-350 lb

Wide variety of popular stem options
Double ball raceways, with dust cover over raceway
Standard zinc-plated finish, nickel (95), chrome (85) and black e-coat (xy) are available
3/8" axle and nuts
Difference between #21 and #75:
#75 series is generously formed with extra material to enhance its durability and appearance, while #21 satisfies most of applications
#75 series with hardened raceway offers better strength with longer life