1) a type of hydraulic wrench, can only solve several similar bolts, generally with 1-10 sleeves;

2) the premise of the manufacturers is best to use an electric pump with two wrench head use, diagonal use, can improve efficiency, torque is more correct;

3) hydraulic wrench must be used by hand, hand custody, often maintenance, such as oil, cleaning, etc .;

4) bolt torque scale should be subject to national standards, GB is in line with China's national conditions.

Hydraulic wrench prices and different models, according to different brands are different.