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：0086-412-8510377 8515277
Fax：0086-412-8562503
E-mail:
MSN:
Homepage：http://www.asyingyi.cn