426 Chrysler, Plymouth, Mopar Hemi Rocker Shafts, set of 4. These shafts are precision ground from special hardened steel. They are then treated for hardness with "Milonite Nitride QPQ" process to a hardness greater and deeper than chrome. Oiling holes and grooves have been improved for better oiling. These shafts come with removaable O-Ringed End Plugs, for easy cleaning. Complete set of 4 shafts.