Disc Springs Spring Steel 51 Cr V4 Dimensions (mm) QTY 70(Outer Diameter) * 40.5(Inner Diameter) * 4(THICK) 64 112(Outer Diameter) * 57(Inner Diameter) * 4(THICK) 90 70(Outer Diameter) * 40.5(Inner Diameter)* 5(THICK) 175