"MASTER,GAGE,FRONT TURBINE CASE USED TO SET THE GAGE PRIOR TO PRECISION MEASURING OF THE INNER DIA OF THE TURBINE CASE FRONT FLANGE;CONSISTS OF A STEEL BAR HAVING SUPPORT BLOCK DOWELED AND BOLTED TO THE TOP SURFACE OF EACH END;EACH SUPPORT BLOCK HAS A REPLACEABLE WEAR INSERT ATTACHED TO THE INNERMOST FACE OF EACH BLOCK; CONTROLLED DIMENSION BETWEEN THE TWO INSERTS IS 26.7000 PORM 0.0002"