Features:Self-tightening key-less feature.Heavy duty design, suitable for CNC Lathe/milling, drill press.High precision, high gripping force, high reliability and stability..Specification:0.2 - 16.0 mm + Mandrel MK10.2 - 16.0 mm + Mandrel MK20.2 - 16.0 mm + Mandrel MK30.2 - 16.0 mm + Mandrel MK45.0 - 20.0 mm + Mandrel MK25.0 - 20.0 mm + Mandrel MK3MK 1 = thin 9.5 mm - thick 12.0 mmMK 2 = thin 14.5 mm - thick 18.0 mmMK 3 = thin 20.0 mm - thick 24.0 mmMK 4 = thin 26.5 mm - thick 31.0 mmPackage included:1pcs Taper Shank1pcs Keyless Drill Chuck