This 12 bit Shell face mill is in great shape..The Ingersoll 5" inch shell is 6A3B05RO1..And the toll holder is an Erickson CV50BSMC150240..I'm not sure if that is compatible with CAT50 or NMTB50 . The last 2 pictures show them taken apart. The Arbor size is 1-1/2" and the lock bolt is 3/4" fine thread ..But maybe you know that.I will package it properly and ship it right away.