... for the material of this kind of nut: Grade3.6,4.6,4.8,5.6,6.8,8.8,9.8,10.9,12.9,etcCarbon steelGr.B,Gr.C,Gr.D,Gr.36,Gr ... requirements.How aout the delivery?(1),Delivery port:ShangHai/NingBo(2),Delivery way to avoid the anti-dumpingWhy should you choose ... experience for exporting so that you could avoid lots ofrisks. zinc-plated metal connector