Drill Chuck by drill chuck sleeve, elastic dial ring, connecting block, cover components.In the drill Chuck, its axial position is accomplished by using connection block, to toggle through the circular Jack, under the thread tension dial ring axial movement,precise auto-centering and clamping drill.Needed when working with the drill Chuck of different drilling tools (for example, Center drills, drill bits, reamers, taps, etc), you can loosen the set screw, turn the fan to the desired position, fasten set screws, movement of multi-station drilling Chuck.