ITEM NAME:2X(R8 Shank To Mt2 R8 Drill Chuck Arbor Taper Adapter Sleeve X4Q4) 2X(R8 Shank To Mt2 R8 Drill Chuck Arbor Taper Adapter Sleeve X4Q4) 2X(The function is used to determine the position of the hole on the workpiece to be machined, to guide the cutter to process, and to improve the rigidity of the tool in the machining process and prevent the vibration in the machining process. Processing: Heat treatment Color: silver Material:40CR size:Length: 127mm Shank: 24mm Thread: 7/16 inch Package Contents: 1x Drill chuck)