... , ordinary screws Material:carbon steel Fasteners1. Products Detailes: 1NameScrew,bolts.nuts2MaterialIron,carbon ... Tin-plated,Sandblast &Anodize,Chromate,6Heat treatmentsoft, case harden, Grade4.8,6.8, 8.8, 10.9, 12.9, and ... formal quotation sheet12Head typesPan head,round head,round washer head,recessed head13Drive typesSlot, ... technical staff for design and quality control.4. Workshop Show:We ...