Yongkang St. Chang Co. remind everyone to buy stainless steel security door security level to note: Stainless steel security door security is divided into A, B, C3 level. C-level security for maximum performance, followed by Class B, A minimum grade stainless steel building door ordering, the market mostly for A-grade stainless steel building door supply, generally applicable to ordinary families. A-level requirements: All steel, flat open fully enclosed, general machinery, hand tools and portable power tools complement each other under the action of its weakest link can resist abnormal open net time ≥15 minutes, or should not be cut out of a wear 615 square centimeters of the hole through the door. No matter what it is stainless steel building door factory direct, you want to last longer, and that maintenance is certainly very important. The door is the same, you want to become longer life stainless steel building door building doors, and always keep the shiny, maintenance is very important. Stainless Loumen surface must be cleaned regularly to maintain its beautiful surface and prolong life. Kang City, San Chang Co. in stainless steel anti-theft window manufacturing and sales. Our company has strong technical strength, superb production technology, a sound management system and quality testing. Stainless steel building door manufacturer | Yunnan steel building door | St. Chang Industry and Trade variety offered by St. Chang Ltd. Yongkang. Yongkang St. Chang Ltd. (www.shengchangco.com/about/) strong, credible, Jinhua in Zhejiang housewares industry has accumulated a large inventory of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the St. Chang Industry and Trade into the brilliant and you work for a better future!