- Tough material for extreme Duty
King Bearings a perfect all around high performance bearing to Suit the focus RS Mk1 and all Zetec E iron Block Versions.
If you need a heavy duty bearing these are more than man enough !
They have the ability to remain soft during break in, and will stand up to abuse. These can maintain very tight and consistent tolerances, +/- 0.0004mm after moderate-heavy operation.