Flat washer 1) DIN125 / DIN9021 2) carton steel, Q235 3) EG, ... coat ,HDG, Plain,etc. 4) ISO9001:2000 The specification of Flat Waher:(1) Standard:DIN125, DIN9021(2) Material: carton steel, steel ... ) Surface treatment: hot dip galvanize, zinc plated, Black or plain(6) Packing: 25kg/carton or as your requirement(7) Payment: TT ...