flat, 1-piece, non-adjustableFor 5/16" diameter pushrods and 8mm Rocker StudsFit GM LS engines with "rectangle port" cylinder heads (Ex. LS3/L92/L99/L76)Designed using stereo lithography Techniques for an accurate fitFeature exact Stud placement and rounded contact pointsNecessary for high lift/spring pressure environments of performance enginesHardened and black oxide finished