1″ x 1-7/8″ Shank Straight Shell Mill Arbor Holder JCT63004 Unthreaded Pilot
I have what I believe to be a Shell Milling Arbor. It has a shank diameter of 1″ and a shank length of 1.75″ The overall diameter of the cutting surface measures out to approximately 1.72″ without the cutting teeth installed. This is a new tool but it has been laying around and has a few minor scuffs on it. From my inspection it does not appear to have ever had cutting teeth installed on it.