Chrome steel, Hardness HRC 61 to 64; P0, P6 and P5 quality; Z1V1 or Z2V2. itemsizeMR84ZZ4*8*3MR85ZZMR126ZZMR105ZZMR83ZZ3*8*2.5MR93ZZ3*9*4MR74ZZ4*7*2.5MR84ZZ4*8*3MR104ZZ4*10*4MR85ZZ5*8*2.5MR95ZZ5*9*3MR105ZZ5*10*4MR115ZZ5*11*4MR106ZZ6*10*3MR126ZZ6*12*4MR117ZZ7*11*3MR137ZZ7*13*3MR128ZZ8*12*3.5MR128ZZ8*12*3.5MR148ZZ8*14*4MR83ZZ3*8*2.5MR93ZZ3*9*4MR74ZZ4*7*2.5MR84ZZ4*8*3MR104ZZ4*10*4MR85ZZ5*8*2.5MR95ZZ5*9*3MR105ZZ5*10*4