Features Good quality: The drill sleeve is made of high-quality 45# steel, which is strong, easy to use, wear-resistant and has a long service life. Quenching process: The drill sleeve adopts the overall quenching process and has strong impact resistance. Exquisite workmanship: The drill sleeve has high precision, fine workmanship, and is smooth both inside and outside. Variety of options: Drill bushings are easy to store and maintain, making them very useful. There are 4 types for you to choose from. High efficiency: The drill sleeve is suitable for the use of tapered shank milling cutters, tapered shank drill bits, and tapered shank reamers to improve work efficiency. 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. Specifications: Material: 45# steel Type: MT1 to MT2, MT2 to MT3, MT3 to MT4, MT4 to MT5(Optional) Hardness: 50 HRC Type D(mm) d(mm) L(mm) External Taper (MT.NO.S) Internal Taper (MT.NO.T) Inner Hole Length(mm) Weight(g) MT1 to MT2 17.78 12.065 92 2 1 56 89 MT2 to MT3 23.825 17.78 112 3 2 67 174 MT3 to MT4 31.267 23.825 140 4 3 84 350 MT4 to MT5 44.399 31.267 171 5 4 107 1000 Package Included: 1 x Taper Drill Sleeve Note: 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. Package List