Standard Pack = 1 piece(s). Type = Shell Mill Arbor ; Overall Diameter = 2.5 Inch ; Body Width = 1.69 Inch ; Taper Type = CAT40 ; Material = 8620 Steel ; Style = Single Ended ; Coolant Supply = Optional through Arbor Screw ; Hub Diameter = 0.75 Inch ; Gage Length = 1.37 Inch ; Gage Length-Face Contact = 1.245 Inch ; Pilot Length = 0.69 Inch ;