With heat-treatment, the product has good toughness and higher- structural strength The unique thrust bearing- is easy to convert the torque- applied by the handle- into greater clamping force The locking plate is installed in the back sleeve, which can loosening and loosening in the work more effectively and make the clamp more when holding the tool It is easy to convert your wrench / driver / rotary hammer to normal drill metal materials, and practical, Manufacturer: TOWARDSNAN