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829 SMALL HOLE GAGES .125-.500"/3.2-12.7MM These full-ball gages are used for general work.
830 SMALL HOLE GAGES .125-.500"/3.2-12.7MM
These gages are exactly the same as the 831 Small Hole Gage except that all gages are only 2" (50mm) long, making them convenient to use in close quarters.