... 3.Tolerance:0.5-1mm steel tube used in Chair frame assembly parts Production Description Haiyan ... strong box , by clients request8)CertificationISO9001-2008Details show Application*Used in the machinery, construction, electronics, furniture, telecoms and related ... , machine part, Auto part,tube bending ,welding part4. Used in the machinery, construction, electronics, furniture and related fields; 5 ...