Vockeen hi-performance push rods compatible with VW air-cooled engines are made from 4130 Chromoly cold drawing seamless tube, cut to length 11.60'', 3/8'' outer diameter, wall thickness 0.088'', 8 pcs per set. Chromoly ball tips are CNC machined and heat-treated to HRC 60, will not wear out in extreme working conditions. 11.60'' long, should be cut to length, enables the builder to assemble them to exact requirements. OD ground for consistency and black oxidized finish with length laser etched on, easy to identify. Blank end has been delicately reamed, reamed length 25mm.