thick wall big rectangular and square tubes 1. max wall thickness 40mm 2. max OD 800 mm 3. ... max lenghth 15meters Specifications1. CE CPD certification 2. max wall thickness 40mm 3. max OD 800 mm 4. max ... , length: 15 meters.\material: Q235B, Q345B, 20#, 16Mn, and alloy material. 2. Rectangular Steel Tubes Min size: 30*40mm ... , Length: 15 meters.material: Q235B, Q345B, 20#, 16Mn, and alloy material.