Mounted on my Grizzly column mill. Mounting a vise is always a pain in the ass, but after only about ten minutes, the stationary jaw on this thing was dialed in within 0.0015\". A half thou was the mounting error over 6\" with about a thou error being a slight lump in the middle of the face of the stationary jaw. More than accurate enough for what I do and damn good for what I paid!