... Material:carbon steel Fasteners1. Products Detailes: 1NameScrew,bolts.nuts2MaterialIron,carbon steel,brass,aluminum,stainless steel3Diameter rangeM3- ... rangethe largest is 35mm5Surface treatmentZinc,Nickle,Passivated,Tin-plated,Sandblast &Anodize,Chromate,6Heat treatmentsoft, case harden, ... the fasteners,and have more prefessional technical staff for design and quality control.4. Workshop Show: ...