THE PRECISION COMPONENTS CAT-40-CHX-1.63 IS AN END MILL HOLDER FEATURING A CAT40 TAPER SIZE. ITS PROJECTION MEASURES 2.25 INCHES. THE OVERALL LENGTH IS 5-1/8 INCHES WITHOUT THE BUTTON AND 6-1/4 INCHES WITH THE BUTTON. IT HAS A 1/4-INCH BORE DIAMETER AND A 1-1/4 INCH OUTER BORE DIAMETER.