Master Setting Ring - Style Setting Frame For comparative gaging, calibration and the setting of internal measuring tools. Specifications include... 9.00" Size + 0.00019" Accuracy 0.000055" Taper / Ovality Features include... Made from oil hardened non-shrinking steel Hardened and tempered to 62 RC Actual dimensions duly etched Cryogenic treatment for long-term dimensional stability Calibrated at 20º C under standards room conditions This is a 3-sided Setting Frame, not a Setting Ring.
