... .8,8.8,9.8... Double End Bolt,Special Head Bolt,Bolt Maker ,M6 Bolt Dimensions1.What’ ... with more than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on ... at modern concept of management.3. We have special research person and more than 100 equipment to ... company had strong technology support,a special quality control procedure,have some special persons in charge of quality ...