Made of high-quality materials, and practical. With heat treatment, the product has good toughness and higher structural strength. The locking function breaks through the traditional locking method, with ratchets on the back. The locking plate is installed in the back sleeve, which can prevent loosening and loosening in the work more effectively and make the clamp more reliable when holding the tool. Good metal texture, comfortable coat . The thrust bearing is easy to convert the torque applied by the handle into greater clamping force. Scope of application: It is suitable for percussion drills with power above 1050W. type:A: 1 x Square mouth Model Number:Adapter Power:Manual Colour:black Material:Metal Package Contents: 1 x Electric drill chuck 1 x Square mouth Only the above package content, other products are not included. Note: Light reflection 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.