Meyer Metric Pin Gage Set 17.82mm - 20.36mm, M5MMP M5MMMMeyer Class Z Metric Pin Gage Set Meyer's Class Z Gage Pin Sets are now made to a closer tolerance (0. 0025mm), are more accurate, and are a better solution for your needs. The old Class ZZ had a size deviation of 0. 005mm. The new Class Z has a size deviation of 0. 0025mm. Features of this set include 17. 82mm to 20. 36mm Class Z Gage Pin Set 128 Pieces in . 02mm increments 51mm Overall Length Sets are traceable to NIST Boxes and Gages are both