Topkit Tower Crane QTZ450K20 And the specification is as follows: 1. Max load 20t 2. Jib length 70m 3. Free standing height 78.9mm 4. mast section 2.5*2.5*6m 5. tip load 5t. The crane have three types, Stationary, Travelling and Internal Climbing.And its mast section adopt split structure, convenient for transportation and storage, save the lond distance freight.The main material of mast sections adopt materials that have fine adaptablity to environment.The mechinisms adopt domestic famous factory products, reliable performance,good governing performance and shocklessness. Container packing.