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About products and suppliers:
Alibaba.com offers 1784 steel door knocker products. 

A wide variety of steel door knocker  options are available to you,  such as modern, industrial and traditional.You can also choose from hotel, apartment and office building steel door knocker,As well as from online technical support, free spare parts, and return and replacement.  and whether steel door knocker is graphic design, total solution for projects, or 3d model design. 

stainless steel door knocker