1. Block structure 2. High stability 3. Saving labour cost of dismuntling 4. Low price 5. Suitable for ocean shipping 1. Mast section dimensions: 1.833x1.833x2.5m2. Main materials: Square steel 135x135x12mm, Q345B3. One 40'HQ can load 6 pcs mast4. Used for QTZ63, QTZ80, QTZ100, QTZ125, QTZ160 tower cranes5. Adopting machine welding6. Adopting sandblasting before painting to avoid corrupting