"MASTER SET,4TH STAGE COMPRESSOR SHROUD; USED TO ZERO OUT THE PWA71773 GAGE WHICH MEASURES THE INNER DIAMETER OF THE POCKET; CONSISTS OF STEEL TUBING W/ AN ANVIL STOP AT ONE END, AND AN ADJUSTABLE BLOCK CONNECTED TO AN ANVIL STOP AT THE OTHER END; 3.600H X 23.671L IN BASIC DIA"