... Thickness 3-12.5mm Weight 1.6-89kg Material 65 Manganese Steel disc plough blade,disc plough blades,coulter,plough coulter ... disc,coulter blade, seeder disc, coulter,65Mn farm bladeMaterial: 65 Manganese Steel Hardness: 42to 48 HRCDisc Size: from 16" to 36 ...