1. With heat treatment, the product has good toughness and higher structural strength. 2. Good metal texture, comfortable coating surface, easy to tighten, so that the output torque increases. 3. The unique thrust bearing makes it easy to convert the torque applied by the handle into greater clamping force. 4. Beautiful and practical surface concave and convex design, so that the front and rear jackets can cooperate effectively and reduce the shaking of the jacket. 5. Scope of application: applicable to AC electric drills with power below 700W and various DC electric drills. Specification: Feature: With heat treatment, the product has good toughness and higher structural strength. Good metal texture, comfortable coating surface, easy to tighten, so that the output torque increases. The unique thrust bearing easily converts the torque applied by the handle into greater clamping force. Beautiful and practical surface concave and convex design, so that the front and rear jackets can cooperate effectively and reduce the shaking of the jacket. Scope of application: applicable to AC electric drills with power below 700W and various DC electric drills. Specification: Material: high speed steel Applicable machine: impact drill Specification: 2-13mm 1/2 Hand-tightening drill chuck: 13mm self-locking all-metal drill chuck Scope of application: applicable to AC electric drills and electric drills DC with power less than 700W. Weight: 282g / 9.9oz Package List: 1 x Chuck Note: 1. The actual color of the product may deviate from the photo due to light. 2. There may be a slight deviation in product measurement.3. Please note that the new type and old type of this product will be sent randomly, and make sure you do not mind before ordering.