use - HRC58 taper shank drill sleeve has high precision, smooth inside and outside, easy to store and maintain. craft - The MT1- MT2 MT2- MT3 MT3- MT4 taper adapter adopts the quenching process as a whole, which has strong impact resistance. application - High hardness taper shank drill bit can reduce reamer. 45 steel - The tapered adapter set is made of high-quality 45 steel, which is not easy to rust and can be used for a long time. Specifications: Model: 1-2 2-3 3-4 Hardness: HRC58 Size: MT1- MT2: length: 92mm or 3.62in, bottom hole diameter: 12mm or 0.47in MT2- MT3: length: 112mm or 4.41in, bottom hole diameter: 17mm or 0.67in MT3- MT4: length: 133mm or 5.24in, bottom hole diameter: 23mm or 0.91in Weight: 569g colour:Silver Material:metal Package Contents: 1 x MT1- MT2Taper Adapter 1 x MT2- MT3 Taper Adapter 1 x MT3- MT4 Taper Adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.