QTZ Tower cranes,Ce approved,popular for exporting to Mid-east,Africa, ... ,road,up an down turntable etc. use·basis of this tower crane: concrete-type,heavy pressure-type main technical parametersModelMaximum rated torque ... QTZ31.5B315338.6 41.80.83 0.6630/8046/23/5.216.5/24.60.76/0.38 0.40/0.530 ...