furniture screw Whether or not the first, male and female screw series, ordinary screws Material:carbon steel Fasteners1. ... diametre rangethe largest is 35mm5Surface treatmentZinc,Nickle,Passivated,Tin-plated,Sandblast &Anodize,Chromate,6Heat treatmentsoft, case harden, Grade4 ... and have more prefessional technical staff for design and quality control.4. Workshop Show:We have advanced equipment ...