Made of precision ground, high grade tool steel ; Arbor will fit all drill chucks that with a 3JT bore and will fit on any machine tool with a R8 spindle
R8 to Jacobs Taper #6(6JT); Long end is R8, short end is 6JT
Arbor will fit all drill chucks that with a 6JT bore and will fit on any machine tool with a R8 spindle