We are able to supply the square /rectangular hollow section as follow: Material:Q235 Square hollow section: 20*20mm-100*100mm wall thickness: 1.4-4.0mm If you need above product , please dont hesitate to contact me. Best regards, Miss gao, An Shan Ying Yat Trade Co., Ltd. AnShan HongMing Metallurgical Machinery Co., Ltd. Add. Renmin road. #116 Tiexi Dist. AnShan City Liaoning Prov. China Tel£º0086-412-8510377 8515277 Fax£º0086-412-8562503 E-mail: asyingyi11@163.com asyingyi11@126.com MSN: asyingyi11@hotmail.com Homepage£ºhttp://www.asyingyi.cn