... some details about our product .QTZ315 The basic configuration of Tower crane 1,Forearm: Forty-eight meters, seven joints, The top chord ... ,Standard joint: The protagonist steel ∠140×140×10, section:1.5×1.5×2.2m, Upper level: ∠63×6, Diagonal brace ∠75 ... )∠140*12Total power (KW) 23.5Working voltage&frequency 380V/50HZ QTZ31.5