Lian'an Hardware Factory, Jinli Town, Gaoyao City. 1. All of our goods have passed the evaluation of Quality Attesting System Certification issued by our national testing institutions. 2.Doorcloser are passed fire-proofing test formally too 3.we do all the process on doorcloser and hydraulic hinge products by ourselves. 4.we are good at OEM order,to give good suggestion on customers' requirement ( such as,new function, packing, logo design,and delivery method). 5.our Main advantage is we not only provide good qualified goods with reasonable price ,and we also give good service on the delivery,loading,export process and payment method. We sincerely provide clients with all-around service. Please feel free to contact us for further information.