With heat treatment, the product has good toughness and higher structural strength. 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 when holding the tool. Good metal texture, comfortable coat The unique thrust bearing is easy to convert the applied by the handle into greater clamping force. Scope of application: It is suitable for percussion drills with power 1050W., Manufacturer: Jectse