... tall buildings and equipment installation.2,Our tower crane is equipped with all kinds of safety devices ... limiter grip block and trolley brake, etc. The tower crane has steady working, high speed and frequency. And ... in many countries3,We have several kinds of tower crane with different jib, eg:55m,56mITEMTC5513TC5615Rated lifting ... 125*12Working voltage & frequency380V/50HZ380V/50HZ QTZ80 tower crane