THIS PARLEC HIGH PRECISION 501004P IS A CAT 50 SHELL MILL HOLDER. KEY DIMENSIONS INCLUDE AN OVERALL LENGTH (OAL) OF 7.5 INCHES, A GAUGE LENGTH OF 3.25 INCHES, A BODY DIAMETER OF 2.75 INCHES, AND AN ARBOR DIAMETER OF 1.38 INCHES. THE PART NUMBER IS 501004P, AND THE HOLDER TYPE IS CAT 50.