Describe a defect and whatever dimensions you have on hand. The tool checks it against ASTM C1036, C1048, C1376, and ANSI Z97.1 and explains exactly how it reached its conclusion.
1. What kind of defect is it?
2. Enter what you know
Enter dimensions in whichever unit you measure in, the toggle relabels every field, and results show both units. Leave anything blank if you don't have it; the tool will tell you if it's missing something it needs to give a definite answer.