Description:These adapters are made from high quality steel, hardened and tempered, precision ground inside and outside for high concentricity. Taper shank allows the tool to be inserted directly into the machine's spindle to facilitate high-torque applications such as large cut diameters.Features:Made from high quality 45# steel, durable, wear-resistingand long service life.Adopts overallquenching process, strong shock-resistance.High accuracy, fine workmanship,inside and outside are very smooth.Easy to store and maintain, very useful. There are 4 types for your choice.Forthe usage of taper shank cutter, taper shank drills, taper shank reamers, improving work efficiency.Specifications:Material: 45# steelType: MT1 to MT2, MT2 to MT3, MT3 to MT4, MT4 to MT5(Optional)Hardness: 50 HRCTypeD(mm)d(mm)L(mm)External Taper(MT.NO.S)Internal Taper(MT.NO.T)Inner Hole Length(mm)Weight(g)MT1 to MT217.7812.06592215689MT2 to MT323.82517.781123267174MT3 to MT431.26723.8251404384350MT4 to MT544.39931.267171541071000Package Included:1 x Taper Drill SleeveNote:Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.