Very high quality drill chuck. Ensures stable attachment and operation of the drill. Retraction key included. Technical data: Working range of blades: 3-18 mm Thread: 1/2" Features and Application: Drill chuck (drill head) with a key, made only of high-quality steel, the distance of the jaws is from 3 mm to 18 mm. The handle is durable, resistant to any mechanical damage. Handle attachment with 1/2" thread. The holder can be used for drilling with drill bits in wood, for work related to screwing in screws and bolts with a right and left turn. A wrench is included with the handle for assembling and disassembling the drill.