Atoplee MT1 to MT2 Morse Taper Drill Sleeve Reducing Adapter for Lathe Milling Material: 45# steel Accuracy: 0.015mm, Hardness: 50 HRC Inside Taper No. * outside Taper No. *Outer diameter *inner diameter*full length:MT1 * MT2 *18.6mm *12.065mm *90mm Package Included:1pc MT1 to MT2 Morse Taper Adapter