PPM25 Deltronic 25-pc Class X Metric Pin Gage Set (.0025mm steps)Deltronic 25 pc Class X Metric Pin Gage Set The Deltronic 25 pc Class X Metric Pin Gage Set is a unique combination of plug gages that has become a basic measuring tool for the metalworking industry. The PPM25 is a 25 pc pin gage set that includes a Nominal Pin Gage, and then 12 pins in 0. 0025mm steps above the Nominal, and 12 pins in 0. 0025mm steps below the Nominal. Sets can be ordered with ANY desired nominal pin. All Deltronic Class X Gage Pin