THIS WOLF TOOTH CROWN RACE INSTALLATION TOOL ADAPTER FITS THE THREE COMMON SIZES OF CROWN RACES AND ALLOWS FOR INSTALLATION OF THE CROWN RACE WITHOUT DAMAGING SEALS. IT IS COMPATIBLE WITH THE PARK TOOL CRS-15.2 CROWN RACE SETTING TUBE. THE 30MM FITS 1 1/8", THE 33MM FITS 1 1/4", AND 40MM FITS 1 1/2". INTERNAL O-RING RETAINS THIS ADAPTER ON THE SETTING TUBE DURING USE AND STORAGE. CNC MACHINED FROM AIRCRAFT GRADE ALUMINIUM BILLET IN-HOUSE AT WOLF TOOTH'S MINNESOTA HQ