Meyer Metric Pin Gage Set 20.39mm - 22.05mm, M61MMP M61MMMMeyer 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 20. 39mm to 22. 05mm Class Z Gage Pin Set 84 Pieces in . 02mm increments 51mm Overall Length Sets are traceable to NIST Boxes and Gages are both marked