COMP Cams Hi-Tech Oil Restricting Pushrods feature 0.050" oil holes, which are half the size of standard Hi-Tech Pushrods. These pushrods maintain the consistent Hi-Tech Pushrod features, including one-piece 4130 chromemoly material with a wall thickness of .080" and a 60 Rockwell hardness. To avoid confusion, each oil restricted pushrod is clearly labeled with length and diameter. For each engine platform COMP Cams offers five different pushrod lengths to meet any need.