... :black,zinc 4.Certifica:ISO9001:2008 SepecificationHigh strength coupling Long Nut 1 Size of nuts : M3-M362 Material : carbon steel, alloy ... requirment 5 Certificate:ISO9001:2008Our range of product:BOLTS: hex bolts, heavy hex bolts, hex flange bolts, carrage bolts, wheel bolts, ... stud boltsNUTS: hex nuts, heavy hex nuts, hex flange nuts, nylon insert lock nuts, cap nuts, slotted nuts, rivet ...