PLAIN PIN Plug GaugeGo- 3.457 to 3.458 & Nogo-3.479 to 3.480 mm Depth GO -2.803 to 2.805 mm & NOGO – 2.895 to 2.900 mm Go-Nogo Gauge Required to check the Interlocking Bolt 3.9/4.9 Hex Predrilling) PPG3.45/2.8