Pin Gage Plus Cylindrical 52100 Tool Steel - 60/62 Rc Nominal Size (In.) 0.4375 Grade Class ZZ Measuring Range (In.) 0.437 Accuracy (In.) 0.0002/-0.0000 Tolerance Class ZZ (0.0002 In.) 0 Holes Length (In.) 2 Width (In.) 0.4375 Height (In.) 2 Meets/Exceeds ISO 17025 2005 by A2LA Includes Certificate of Accuracy with NIST traceabilityCalifornia proposition 65 warning