Quickly and Easily Removes Sealed U-Joint Caps without Damage to Driveshafts, Yokes or Bearing Caps. Two sizes to work on many cars, trucks and ag equipment. Heat-treated threads and casting for durability. 42890 works on cars, light-duty trucks and ag equipment with 1" to 1.25" bearing caps. 42900 works on cars, medium-duty trucks, ag equipment and light industrial vehicles with 1.25" to 1.7" bearing caps.