high quality plough disc blades material;65mn steel/38mnb5 steel hardness: 38-44 for 65 mn steel; 48-54 for 38 mnb5 steel; diameter:300mm~1116mm/12inches~44inches; thickness:3mm~12mm/ 1/8"~1/2"; weight:1.6kg~89kg/3.5lbs~196lbs; thickness of blades:0.1mm~0.5mm; central holes' shape more...