DIN968 Tapping Screw Certificate:ISO9001, ISO14001 Support:Senior workers 15 years Quality control:100% inspection DIN968 Round Philips Serrated Head Tapping Screws with collar1.Material: Iron,stainless steel,copper and etc..2.Standard :DIN,JIS ISO ,BS,ANSI...ETC3.Surface Finish: zinc plated(white, black, blue, colour), nickel plated, chromated, passivate, phosphated, plain finsh and etc..4. ...