Flat Washer/Plain Washer: 1)Size:M3 to M36, No.6 to 1-1/ ... -2 etc. 3)Mild steel,45C,SUS304 & SUS316 Features:Flat Washer/Plain Washer1) Size: M3 to M36, No.6 to 1 ... -1/2"2) Standards of flat washer: DIN125 & IFI L-2 etc.3) Material: Mild steel, 45C ... .50.50.50.811.61.61.622.52.53333 Flat Washer/Plain Washer