Product instruction：A  self-tapping screw is a screw that can tap its own hole as it is driven into it. For hard substrates such asmetal or ha ... Explore More
Product instruction：hex head flange self drilling screw  drill their own holes when they’re screwed into materials such as wood,Websit ... Explore More
Product instruction：Professional producer of screws from year 2007 , main have self-drill screw , drywall screw , wood screw , slef tapping screw ... Explore More
