A.V.M. is keyless drill chuck professional manufacturers, we have strong independent research and development capacity. We follow modern high-end industry equipment, high precision, high speed digital the development direction, widely apply advanced industrial design thought, make no key drill chuck more compact, more beautiful, more convenient, more reliable and more accord with green environmental protection and energy saving to reduce fuel requirements. A.V.M. keyless drill chuck has a number of China&＃039;s patent technology. The Core technology with independent intellectual property rights.