Precise connecting rod bolt fastener stretch measurements during engine assembly is the preferred method to tighten the fastener to it's ultimate strength. Tavia's connecting rod bolt stretch guage features spherical points for proper repeatable indicator readings. Manufactured from high alloy steel for thermal stabilty. Features include large 2.4" diameter indicator face. Indicator dial graduations .0005" increments. Lower mount adjuster screw with locknut for fine calibrations. Adjustable both in length and for right and left hand configurations.