... DIN,ANSI,BS,JIS,GB Item NameJL-SCR-032 Round WasherMaterialIron, Brass, Carton steel, Stainless steel, Alloy ... steelSurface TreatmentChrome plating, Silver plating, Zinc plating, Nickel plating, Tin-plating, Passivate, Oxidation, Phosphorization, Radiant PlatedStandardsJIS, ANSI, DIN, ... and etc.2. by head typesFlat, Oval, Binding, Pan, Round, Truss, Button, PF, Pan washer, Cheese, Countersunk, Fillister ...