THE SCULLY JONES 95414 IS AN X-PRESS-CHANGE END MILL HOLDER. THE SPECIFICATIONS DETAIL THAT IT IS A CAT 45 HOLDER TYPE WITH AN OVERALL LENGTH (OAL) OF 4-1/2 INCHES. IT FEATURES A BORE DIAMETER OF 7/16 INCHES, A BODY DIAMETER OF 1 INCH, AND A PROJECTION OF 1-3/8 INCHES.