Supertech cam followers, set of 12, measure 34 x 21 x 6.5 with an added shim and an 8mm diameter shaft, finished with a DLC coating. Sold as a complete set for valvetrain service, these cam followers are intended for direct replacement where the specified dimensions and 8mm diameter shaft are required. The DLC coating is noted in the description for surface treatment.
Supertech Cam Follower 34 x 21 x 6.5+ Shim 8mm Dia DLC Coated - (Set of 12)