Lathe alignment test bar - test mandrel Shank size - mt 5 Re-align the tail-stock on your lathe to eliminate that slight taper when turning over a long distance. Manufactured from en31 alloy steel. Useful for alignment test between centers as well as in morse taper spindles Accuracy within 1 micron. Max.run-out :0.0001". Overall length : 442mm (17-1/2")