material:steel,mild steel,A2/A3/A4,copper,brass, aluminum , bronze etc.
surface:Plain ,HDG ,YZP ,black ,ZP(CR3+/CR6+) etc.
standard:DIN , SAE /USS, ISO, JIS , BS, NFE,etc. and Non-standard.
applica...Liaocheng Hong?Yu?Metal?Co.,LTD
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