The main-shafts is of integrated type, which is much more superior than the traditional design.The major features are as follows: 1. Extremely rigid construction.2. The accumulative tolerances can be reduced to a minimum, since the traditional mechanism requiring an AROBOR to connect the Drill Chucks which will generate the accumulative tolerances.The Integrated type Keyless Drill Chuck is designed to solve this problem totally. 3. Prevent the Drill Chucks from falling out.4. Extremely safe in operation.
